Many fish change sex over the course of their lifespan, a phenomenon called sequential hermaphroditism. In clownfish, smaller fish are male, and the dominant and largest fish in a group becomes female. In many wrasses the opposite is true—most fish are initially female and become male when they reach a certain size. Sequential hermaphrodites may produce both types of gametes over the course of their lifetime, but at any given point they are either female or male.
The preppy East Coast label has collaborated with everyone from Sacai and Supreme to Vetements, but West’s topper was a fresh foil for her typically sexed-up take on sportswear. — Edward Barsamian, Vogue, "Kim Kardashian West Has a New Favorite Outerwear Brand," 13 Dec. 2018 Yandy’s ark of offerings is evidence that pretty much any animal can be sexed up, although not all animals are equally alluring. — Rachel Sugar, Vox, "Why are “sexy” cats a thing?," 26 Oct. 2018 The most sexed-up take on the look saw one guy swaggering down the runway like a cheeky gunslinger. — Liana Satenstein, Vogue, "Are You Ready for the Return of Tighty-Whities? Gucci Sure Is," 25 Sep. 2018 Wills is officially headed to paradise, or, at least, sexed-up Bachelor Nation spin-off series Bachelor In Paradise, as People announced. — refinery29.com, "Can We Start The Wills Reid For Bachelor Campaign Right Now?," 10 July 2018 The classic look would often get sexed up with spit curls that lay slicked to the forehead, at the nape of the neck, or in front of the ear, thanks to the influence of Josephine Baker. — Rebecca Norris, Allure, "Watch 100 Years of Iconic Short-Hair Trends in Under Four Minutes," 22 May 2018 Each walleye harvested by the tribes is measured and sexed. — Paul A. Smith, Milwaukee Journal Sentinel, "Smith: Researchers document walleye decline in Wisconsin waters," 9 May 2018 What ensues is a modern-day, faintly unpleasant, sexed-up comedy of errors on both sides. — Jocelyn Mcclurg, USA TODAY, "Curtis Sittenfeld has her finger on America's pulse in 10 witty, zippy short stories," 30 Apr. 2018 His aura was a regal, ethereal, sexed-up shade of purple, and his style had to match all of that pomp. — Brooke Bobb, Vogue, "Meet the Man Who Made 3,000 Pairs of High Heels for Prince," 19 Apr. 2018
The vaginal opening and the urethral opening are only visible when the labia minora are parted. These opening have many nerve endings that make them sensitive to touch. They are surrounded by a ring of sphincter muscles called the bulbocavernosus muscle. Underneath this muscle and on opposite sides of the vaginal opening are the vestibular bulbs, which help the vagina grip the penis by swelling with blood during arousal. Within the vaginal opening is the hymen, a thin membrane that partially covers the opening in many virgins. Rupture of the hymen has been historically considered the loss of one's virginity, though by modern standards, loss of virginity is considered to be the first sexual intercourse. The hymen can be ruptured by activities other than sexual intercourse. The urethral opening connects to the bladder with the urethra; it expels urine from the bladder. This is located below the clitoris and above the vaginal opening.[8][page needed]

Reproductive and sexual rights encompass the concept of applying human rights to issues related to reproduction and sexuality.[92] This concept is a modern one, and remains controversial, especially outside the West, since it deals, directly and indirectly, with issues such as contraception, LGBT rights, abortion, sex education, freedom to choose a partner, freedom to decide whether to be sexually active or not, right to bodily integrity, freedom to decide whether or not, and when, to have children.[93][94][95] According to the Swedish government, "sexual rights include the right of all people to decide over their own bodies and sexuality" and "reproductive rights comprise the right of individuals to decide on the number of children they have and the intervals at which they are born."[96] Such rights are not accepted in all cultures, with practices such criminalization of consensual sexual activities (such as those related to homosexual acts and sexual acts outside marriage), acceptance of forced marriage and child marriage, failure to criminalize all non-consensual sexual encounters (such as marital rape), female genital mutilation, or restricted availability of contraception, being common around the world.[97][98]


The bryophytes, which include liverworts, hornworts and mosses, reproduce both sexually and vegetatively. They are small plants found growing in moist locations and like ferns, have motile sperm with flagella and need water to facilitate sexual reproduction. These plants start as a haploid spore that grows into the dominate form, which is a multicellular haploid body with leaf-like structures that photosynthesize. Haploid gametes are produced in antherida and archegonia by mitosis. The sperm released from the antherida respond to chemicals released by ripe archegonia and swim to them in a film of water and fertilize the egg cells thus producing a zygote. The zygote divides by mitotic division and grows into a sporophyte that is diploid. The multicellular diploid sporophyte produces structures called spore capsules, which are connected by seta to the archegonia. The spore capsules produce spores by meiosis, when ripe the capsules burst open and the spores are released. Bryophytes show considerable variation in their breeding structures and the above is a basic outline. Also in some species each plant is one sex while other species produce both sexes on the same plant.[27]

Please note that some translations using Google Translate may not be accurately represented and downloaded documents cannot be translated. Dana-Farber assumes no liability for inaccuracies that may result from using this third-party tool, which is for website translation and not clinical interactions. You may request a live medical interpreter for a discussion about your care.
The sexual response cycle is a model that describes the physiological responses that occur during sexual activity. This model was created by William Masters and Virginia Johnson. According to Masters and Johnson, the human sexual response cycle consists of four phases; excitement, plateau, orgasm, and resolution, also called the EPOR model. During the excitement phase of the EPOR model, one attains the intrinsic motivation to have sex. The plateau phase is the precursor to orgasm, which may be mostly biological for men and mostly psychological for women. Orgasm is the release of tension, and the resolution period is the unaroused state before the cycle begins again.[8][page needed]
late 14c., "males or females collectively," from Latin sexus "a sex, state of being either male or female, gender," of uncertain origin. "Commonly taken with seco as division or 'half' of the race" [Tucker], which would connect it to secare "to divide or cut" (see section (n.)). Meaning "quality of being male or female" first recorded 1520s. Meaning "sexual intercourse" first attested 1929 (in writings of D.H. Lawrence); meaning "genitalia" is attested from 1938. Sex appeal attested by 1904.
The link between constructed sexual meanings and racial ideologies has been studied. Sexual meanings are constructed to maintain racial-ethnic-national boundaries by denigration of "others" and regulation of sexual behavior within the group. According to Joane Nagel, "both adherence to and deviation from such approved behaviors, define and reinforce racial, ethnic, and nationalist regimes".[71][72] Scholars also study the ways in which colonialism has affected sexuality today and argue that due to racism and slavery it has been dramatically changed from the way it had previously been understood.[73] These changes to sexuality are argued to be largely effected by the enforcement of the gender binary and heteropatriarchy as tools of colonization on colonized communities as seen in nations such as India, Samoa, and the First Nations in the Americas, resulting in the deaths and erasure of non-western genders and sexualities. In the United States people of color face the effects of colonialism in different ways with stereotypes such as the Mammy, and Jezebel for Black women; lotus blossom, and dragon lady for Asian women; and the "spicy" Latina.[74]
Alfred Kinsey initiated the modern era of sex research. He collected data from questionnaires given to his students at Indiana University, but then switched to personal interviews about sexual behaviors. Kinsey and his colleagues sampled 5,300 men and 5,940 women. He found that most people masturbated, that many engaged in oral sex, that women are capable of having multiple orgasms, and that many men had had some type of homosexual experience in their lifetimes. Many[who?] believe he was the major influence in changing 20th century attitudes about sex. Kinsey Institute for Research in Sex, Gender, and Reproduction at Indiana University continues to be a major center for the study of human sexuality.[8][page needed] Before William Masters, a physician, and Virginia Johnson, a behavioral scientist, the study of anatomy and physiological studies of sex was still limited to experiments with laboratory animals. Masters and Johnson started to directly observe and record the physical responses in humans that are engaged in sexual activity under laboratory settings. They observed 10,000 episodes of sexual acts between 312 men and 382 women. This led to methods of treating clinical problems and abnormalities. Masters and Johnson opened the first sex therapy clinic in 1965. In 1970, they described their therapeutic techniques in their book, Human Sexual Inadequacy.[full citation needed][8][page needed]
"On the Basis of Sex" is a bio-pic about the early years in Ruth Bader Ginsburg's career. As the movie opens, she is a first year student at Harvard Law. When her husband Martin, himself a second year student there, becomes gravely ill, she attends both her own and Martin's classes, and of course caring for him. A couple of years later, Martin is hired by a prominent New York law firm, and Ruth transfers to Columbia Law to finish her law degree. She graduates top of the class, yet not a single law firm in New York offers her a job... At this point we are less than 15 min. into the movie but to tell you more of the plot would spoil your viewing experience, you'll just have to see for yourself how it all plays out.
Psychological theories exist regarding the development and expression of gender differences in human sexuality. A number of them, including neo-analytic theories, sociobiological theories, social learning theory, social role theory, and script theory, agree in predicting that men should be more approving of casual sex (sex happening outside a stable, committed relationship such as marriage) and should also be more promiscuous (have a higher number of sexual partners) than women. These theories are mostly consistent with observed differences in males' and females' attitudes toward casual sex before marriage in the United States; other aspects of human sexuality, such as sexual satisfaction, incidence of oral sex, and attitudes toward homosexuality and masturbation, show little to no observed difference between males and females. Observed gender differences regarding the number of sexual partners are modest, with males tending to have slightly more than females.[14]
At first, the drop was attributed to the Great Recession, and then to the possibility that Millennial women were delaying motherhood rather than forgoing it. But a more fundamental change may be under way. In 2017, the U.S. birth rate hit a record low for a second year running. Birth rates are declining among women in their 30s—the age at which everyone supposed more Millennials would start families. As a result, some 500,000 fewer American babies were born in 2017 than in 2007, even though more women were of prime childbearing age. Over the same period, the number of children the average American woman is expected to have fell from 2.1 (the so-called replacement rate, or fertility level required to sustain population levels without immigration) to 1.76. If this trend does not reverse, the long-term demographic and fiscal implications will be significant.
During ovulation, the ovum travels down the Fallopian tubes to the uterus. These extend about four inches (10 cm) from both sides of the uterus. Finger-like projections at the ends of the tubes brush the ovaries and receive the ovum once it is released. The ovum then travels for three to four days to the uterus.[8][page needed] After sexual intercourse, sperm swim up this funnel from the uterus. The lining of the tube and its secretions sustain the egg and the sperm, encouraging fertilization and nourishing the ovum until it reaches the uterus. If the ovum divides after fertilization, identical twins are produced. If separate eggs are fertilized by different sperm, the mother gives birth to non-identical or fraternal twins.[29]

It's important to note that having sex can also promote a heart attack in those at risk, but having sex more often may help reduce this concern. While sex can precipitate a heart attack, and anyone at risk should talk to their doctor before having sex, a 2011 study published in JAMA, found that this risk is diminished in people who have high levels of regular sexual activity. In other words, and similar to other forms of physical activity such as running, infrequent activity could put a strain on the blood flow to the arteries supplying the heart, but regular activity may be protective.
In human beings, sexuality is multifactorial, with several factors that interact (genes, hormones, conditioning, sexual preferences, emotions, cognitive processes, cultural context). The relative importance of each of these factors is dependent both on individual physiological characteristics, personal experience and aspects of the sociocultural environment.[48]

Maybe you want to know how to determine such ones for yourself. But, unfortunately… Firstly, it is not that fast as you want, secondly, you can determine it only through your personal search, by trying and experimenting. However, don’t get sad, because there is a nice news! – this search will be the most sweet and delightful, trust us!) So, before start the search, you need to remember 7 important rules.
Reproductive and sexual rights encompass the concept of applying human rights to issues related to reproduction and sexuality.[92] This concept is a modern one, and remains controversial, especially outside the West, since it deals, directly and indirectly, with issues such as contraception, LGBT rights, abortion, sex education, freedom to choose a partner, freedom to decide whether to be sexually active or not, right to bodily integrity, freedom to decide whether or not, and when, to have children.[93][94][95] According to the Swedish government, "sexual rights include the right of all people to decide over their own bodies and sexuality" and "reproductive rights comprise the right of individuals to decide on the number of children they have and the intervals at which they are born."[96] Such rights are not accepted in all cultures, with practices such criminalization of consensual sexual activities (such as those related to homosexual acts and sexual acts outside marriage), acceptance of forced marriage and child marriage, failure to criminalize all non-consensual sexual encounters (such as marital rape), female genital mutilation, or restricted availability of contraception, being common around the world.[97][98]
Technique: Sit on the edge of the bed or on a chair with your feet on the floor. She turns away and backs up onto you, sitting between your legs. She can ride back and forth by pushing off the chair arms or pressing up with her feet. She can control the angle of entry by arching her back and pressing her buttocks into your groin. While doggy style is about your dominance, The Hot Seat puts her in the driver's seat. And that makes it one of the best sex positions for both of you.

↑ Jump up to: 8.0 8.1 Dinitia Smith, "Central Park Zoo's gay penguins ignite debate", San Francisco Chronicle (February 7, 2004). Article is mainly about gay penguins but also mentions homosexuality in dolphins, and also says 'In bonobos, she noted: "you see expressions of sex outside the period when females are fertile."' Available online at http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2004/02/07/MNG3N4RAV41.DTL.

Early on, most Western accounts of all this had a heavy subtext of “Isn’t Japan wacky?” This tone has slowly given way to a realization that the country’s experience might be less a curiosity than a cautionary tale. Dismal employment prospects played an initial role in driving many men to solitary pursuits—but the culture has since moved to accommodate and even encourage those pursuits. Roland Kelts, a Japanese American writer and longtime Tokyo resident, has described “a generation that found the imperfect or just unexpected demands of real-world relationships with women less enticing than the lure of the virtual libido.”
Human sexuality can be understood as part of the social life of humans, which is governed by implied rules of behavior and the status quo. This narrows the view to groups within a society.[18][page needed] The socio-cultural context of society, including the effects of politics and the mass media, influences and forms social norms. Before the early 21st century, people fought for their civil rights. The civil rights movements helped to bring about massive changes in social norms; examples include the sexual revolution and the rise of feminism.[69][70]

The academy enforces mandatory sexual harassment and assault prevention and awareness training through its office of Sexual Assault Prevention and Response and the Sexual Harassment and Assault Prevention Education, or SHAPE, program. Midshipmen participate in the program during every year they attend the academy. Midshipmen attend one fewer session every year, beginning with four during their plebe year.
Audrey Munson (a real-life model) first appeared artistically nude in George Foster Platt's controversial Inspiration (1915) from the Mutual Film Corporation, as a sculptor's model. It was the first known film in which a leading actress stripped down to be naked, making her the first nude film star. Munson also appeared nude in another silent film, Rea Burger's 7-reel Purity (1916), in a dual role as a spirit figure and as an artist's nude model named Purity/Virtue.
Al Franken, the former Democratic senator from Minnesota, should never have been pressured, even bullied, into resigning from office. The accusations against him were not properly vetted. Their seriousness was not properly weighed. Nevertheless, the frenzy that followed the accusations resulted in his Democratic colleagues making it impossible for him to continue as a senator.
Adult performer and fetish model Casey Calvert also agrees on missionary being a favorite. “In my book, relaxation is step one to orgasm,” she says. “But besides that, missionary is my No. 1 position because I can control the angle of my pelvis to make sure he's really hitting just the right spot. I can do the same in cowgirl; I'm just more of a girl-on-the-bottom kinda girl!”
Technique: The most commonly used position in the world, the missionary is an especially intimate position allowing for face-to-face contact. You like it because you can control penetration depth and speed of thrusting. She enjoys feeling your weight on her body, and the maximum skin-to-skin contact. Note that this position can make it more difficult to hold off ejaculation because of the intense friction and deep thrusting. To lengthen lovemaking, start there then switch to a position that maintains clitoral pressure without so much pelvic back and forth.

This one is especially for men. You need to have good control on your muscles to ensure that you can ejaculate at an appropriate time. Too soon and you may leave your partner unsatisfied; too late and it might leave your partner feeling as if they're pumping iron at the gym. To avoid this, spend a lot more time on foreplay (this will help men as well as women). If you take too long and can only ejaculate via manual stimulation, do your best to get your partner to orgasm and then they can return you the favour.
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