In most birds, both excretion and reproduction is done through a single posterior opening, called the cloaca—male and female birds touch cloaca to transfer sperm, a process called "cloacal kissing".[30] In many other terrestrial animals, males use specialized sex organs to assist the transport of sperm—these male sex organs are called intromittent organs. In humans and other mammals this male organ is the penis, which enters the female reproductive tract (called the vagina) to achieve insemination—a process called sexual intercourse. The penis contains a tube through which semen (a fluid containing sperm) travels. In female mammals the vagina connects with the uterus, an organ which directly supports the development of a fertilized embryo within (a process called gestation).
Yvonne Gardelle appeared naked as temptress demon-wife Lilith to Adam in a pantomimed Garden of Eden prologue sequence in The Tree of Knowledge (1920), directed by Cecil B. DeMille's brother William; press kit materials tauted: "An old legend says that the tempter in Eden was not a serpent, but a beautiful women, Lillith, the demon wife of Adam before Eve was created"
If hookups are your thing, Grindr and Tinder offer the prospect of casual sex within the hour. The phrase If something exists, there is porn of it used to be a clever internet meme; now it’s a truism. BDSM plays at the local multiplex—but why bother going? Sex is portrayed, often graphically and sometimes gorgeously, on prime-time cable. Sexting is, statistically speaking, normal.
Once agricultural societies emerged, the sexual framework shifted in ways that persisted for many millennia in much of Asia, Africa, Europe, and parts of the Americas. One common characteristic new to these societies was the collective supervision of sexual behavior due to urbanization, and the growth of population and population density. Children would commonly witness parents having sex because many families shared the same sleeping quarters. Due to landownership, determination of children's paternity became important, and society and family life became patriarchal. These changes in sexual ideology were used to control female sexuality and to differentiate standards by gender. With these ideologies, sexual possessiveness and increases in jealousy emerged. With the domestication of animals, new opportunities for bestiality arose. Males mostly performed these types of sexual acts and many societies acquired firm rules against it. These acts also explain the many depictions of half-human, half-animal mythical creatures, and the sports of gods and goddesses with animals.[91] While retaining the precedents of earlier civilizations, each classical civilization established a somewhat distinctive approach to gender, artistic expression of sexual beauty, and to behaviors such as homosexuality. Some of these distinctions are portrayed in sex manuals, which were also common among civilizations in China, Greece, Rome, Persia, and India; each has its own sexual history.[91][page needed]
This brings us to fertility-challenged Japan, which is in the midst of a demographic crisis and has become something of a case study in the dangers of sexlessness. In 2005, a third of Japanese single people ages 18 to 34 were virgins; by 2015, 43 percent of people in this age group were, and the share who said they did not intend to get married had risen too. (Not that marriage was any guarantee of sexual frequency: A related survey found that 47 percent of married people hadn’t had sex in at least a month.)
These shifts coincide with another major change: parents’ increased anxiety about their children’s educational and economic prospects. Among the affluent and educated, especially, this anxiety has led to big changes in what’s expected of teens. “It’s hard to work in sex when the baseball team practices at 6:30, school starts at 8:15, drama club meets at 4:15, the soup kitchen starts serving at 6, and, oh yeah, your screenplay needs completion,” said a man who was a couple of years out of college, thinking back on his high-school years. He added: “There’s immense pressure” from parents and other authority figures “to focus on the self, at the expense of relationships”—pressure, quite a few 20-somethings told me, that extends right on through college.

Technique: This is an ideal position if she is pregnant or either one of you had a knee injury because it keeps weight off the body. To get into the position, begin by lying on your sides and facing one another. She spreads her legs slightly to allow you to enter her, then closes her legs so the part of your shaft that's outside can press against her clitoris. It's easy to kiss from this intimate face-to-face position.
As one might imagine, feeling comfortable in your body is good for your sex life. A review of 57 studies examining the relationship between women’s body image and sexual behavior suggests that positive body image is linked to having better sex. Conversely, not feeling comfortable in your own skin complicates sex. If you don’t want your partner to see you getting out of the shower, how is oral sex going to work?

Missionary is one of the most popular sex positions because it delivers results. It is intimate, allowing you to gaze deep into your lover’s eyes as you reach the finish line. “The positioning and motion stimulates the woman’s clitoris, which is what the majority of ladies (close to 70 percent) need in order to orgasm,” says sexologist and Sex With Emily podcast host Emily Morse. “Perhaps this is why women have been rating it their top pick over the years.”


The raised rim at the border of the shaft and glans is called the corona. The urethra runs through the shaft, providing an exit for sperm and urine. The root consists of the expanded ends of the cavernous bodies, which fan out to form the crura and attach to the pubic bone and the expanded end of the spongy body (bulb). The root is surrounded by two muscles; the bulbocavernosus muscle and the ischiocavernosus muscle, which aid urination and ejaculation. The penis has a foreskin that typically covers the glans; this is sometimes removed by circumcision for medical, religious or cultural reasons.[8][page needed] In the scrotum, the testicles are held away from the body, one possible reason for this is so sperm can be produced in an environment slightly lower than normal body temperature.[24][25]

Morse notes that missionary is so great because  there are plenty of ways to spice it up. “For example, instead of laying chest to chest, try holding your partner's legs against your chest, crossed at the ankles with her thigh muscles clenched,” she suggests. “Women will still love this variation because the clenched thighs provide the same amount of clitoral stimulation (if not more), and allow for a little more hip movement to help your partner hit that sweet spot. Men will definitely enjoy the tighter feel, the ability for deeper thrusts, and the increased visibility won’t hurt either.”
The breasts are external organs used for sexual pleasure in some cultures. Western culture is one of the few in which they are considered erotic.[8][page needed] The breasts are the subcutaneous tissues on the front thorax of the female body.[29] Breasts are modified sweat glands made up of fibrous tissues and fat that provide support and contain nerves, blood vessels and lymphatic vessels.[29] Their purpose is to provide milk to a developing infant. Breasts develop during puberty in response to an increase in estrogen. Each adult breast consists of 15 to 20 milk-producing mammary glands, irregularly shaped lobes that include alveolar glands and a lactiferous duct leading to the nipple. The lobes are separated by dense connective tissues that support the glands and attach them to the tissues on the underlying pectoral muscles.[29] Other connective tissue, which forms dense strands called suspensory ligaments, extends inward from the skin of the breast to the pectoral tissue to support the weight of the breast.[29] Heredity and the quantity of fatty tissue determine the size of the breasts.[8][page needed]
Disregarding intermediates, the basic distinction between asexual and sexual reproduction is the way in which the genetic material is processed. Typically, prior to an asexual division, a cell duplicates its genetic information content, and then divides. This process of cell division is called mitosis. In sexual reproduction, there are special kinds of cells that divide without prior duplication of its genetic material, in a process named meiosis. The resulting cells are called gametes, and contain only half the genetic material of the parent cells. These gametes are the cells that are prepared for the sexual reproduction of the organism.[6] Sex comprises the arrangements that enable sexual reproduction, and has evolved alongside the reproduction system, starting with similar gametes (isogamy) and progressing to systems that have different gamete types, such as those involving a large female gamete (ovum) and a small male gamete (sperm).[7]

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]


In the late 20th century, very effective forms of contraception (birth control) were developed allowing a man and women to help prevent a baby from being made when they have sex. One type of contraception is a condom. This is a piece of rubber that covers the penis that a man can wear during intercourse, which stops the man's semen from going into the woman's vagina. This does not always work though because the condom may rip or tear. Another well-known type of contraception is called the Pill, which a woman takes every day. When a woman is "on the Pill," she and her partner may have sex any time they wish with very little chance of making a baby. It is recommended that a couple who have a sexual relationship use two forms of contraception. That way if one fails the other is a 'backup'. Contraception allows people to keep "sex for fun" separate from "sex to make children". For example, a fertile couple may use contraception to experience sexual pleasure (recreational). At the same time, this experience may strengthen their relationship, and a stronger relationship may mean that they will better be able to raise children in the future.
These shifts coincide with another major change: parents’ increased anxiety about their children’s educational and economic prospects. Among the affluent and educated, especially, this anxiety has led to big changes in what’s expected of teens. “It’s hard to work in sex when the baseball team practices at 6:30, school starts at 8:15, drama club meets at 4:15, the soup kitchen starts serving at 6, and, oh yeah, your screenplay needs completion,” said a man who was a couple of years out of college, thinking back on his high-school years. He added: “There’s immense pressure” from parents and other authority figures “to focus on the self, at the expense of relationships”—pressure, quite a few 20-somethings told me, that extends right on through college.
One recurring theme, predictably enough, was porn. Less expected, perhaps, was the extent to which many people saw their porn life and their sex life as entirely separate things. The wall between the two was not absolute; for one thing, many straight women told me that learning about sex from porn seemed to have given some men dismaying sexual habits. (We’ll get to that later.) But by and large, the two things—partnered sex and solitary porn viewing—existed on separate planes. “My porn taste and partner taste are quite different,” one man in his early 30s told me, explaining that he watches porn about once a week and doesn’t think it has much effect on his sex life. “I watch it knowing it is fiction,” a 22-year-old woman said, adding that she didn’t “internalize” it.
Having seen this title, many people expect a list or photos of the best positions which can help get most pleasure. But we will disappoint you!)) Here’s no such list, moreover, it does not exist and can not even exist. The thing is that notion of “the best sex positions” is not correct and now you will understand why. Everybody knows that all people differ, men, women – we all are different. And what is good for one person may not work with others and vice versa. And that is why to determine a list of poses which would be “best” for everybody is impossible.
Many insects use a sex determination system based on the number of sex chromosomes. This is called X0 sex-determination—the 0 indicates the absence of the sex chromosome. All other chromosomes in these organisms are diploid, but organisms may inherit one or two X chromosomes. In field crickets, for example, insects with a single X chromosome develop as male, while those with two develop as female.[38] In the nematode C. elegans most worms are self-fertilizing XX hermaphrodites, but occasionally abnormalities in chromosome inheritance regularly give rise to individuals with only one X chromosome—these X0 individuals are fertile males (and half their offspring are male).[39]

^ Mah, Kenneth; Binik, Yitzchak M (7 January 2001). "The nature of human orgasm: a critical review of major trends". Clinical Psychology Review. 21 (6): 823–856. doi:10.1016/S0272-7358(00)00069-6. PMID 11497209. Women rated clitoral stimulation as at least somewhat more important than vaginal stimulation in achieving orgasm; only about 20% indicated that they did not require additional clitoral stimulation during intercourse.
“If this is the case, or if you just feel like trying something a little more comfortable, take this position to the nearest couch or chair,” she says. “Sit up normally and have your partner straddle you so that you are face-to-face, or breasts-to-face, depending on height. Instead of bouncing up and down like they do in all of your favorite movies, have your partner swirl around in circles and rock back and forth so that the penis hits the wall of her G-spot over and over again. This grinding motion should also do some pretty magical things for her clitoris too, hopefully resulting in an elusive blended orgasm.”
Meanwhile, the U.S. teen pregnancy rate has plummeted to a third of its modern high. When this decline started, in the 1990s, it was widely and rightly embraced. But now some observers are beginning to wonder whether an unambiguously good thing might have roots in less salubrious developments. Signs are gathering that the delay in teen sex may have been the first indication of a broader withdrawal from physical intimacy that extends well into adulthood.
For men, while it was once thought that sex caused an increase in prostate cancer, a 2016 study found that men who had more ejaculations (21 or more per month) were less likely to develop the disease than men who had fewer (seven ejaculations or less per month). Since prostate cancer is the second leading cause of cancer-related deaths in men, this is worth noting.
This year, almost 60 percent of women and 20 percent of men attending the Naval Academy said they experienced sexual harassment, according to the Defense Department report, up from 44 percent of women and 9 percent of men in 2016. Reports of sexual assault increased from 29 to 32 reports over the past two school years. The 32 reports mark the most the academy has received in more than a decade.

The uterus or womb is a hollow, muscular organ where a fertilized egg (ovum) will implant itself and grow into a fetus.[8][page needed] The uterus lies in the pelvic cavity between the bladder and the bowel, and above the vagina. It is usually positioned in a 90-degree angle tilting forward, although in about 20% of women it tilts backwards.[29] The uterus has three layers; the innermost layer is the endometrium, where the egg is implanted. During ovulation, this thickens for implantation. If implantation does not occur, it is sloughed off during menstruation. The cervix is the narrow end of the uterus. The broad part of the uterus is the fundus.[8][page needed]

Organisms of many species are specialized into male and female varieties, each known as a sex.[1][2] Sexual reproduction involves the combining and mixing of genetic traits: specialized cells known as gametes combine to form offspring that inherit traits from each parent. The gametes produced by an organism define its sex: males produce small gametes (e.g. spermatozoa, or sperm, in animals; pollen in seed plants) while females produce large gametes (ova, or egg cells). Individual organisms which produce both male and female gametes are termed hermaphroditic.[2] Gametes can be identical in form and function (known as isogamy), but, in many cases, an asymmetry has evolved such that two different types of gametes (heterogametes) exist (known as anisogamy).
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]
Desire is part biology, part psychology, often as subtle as it is predictable, and takes shape differently in men and women. For men, arousal typically precedes desire. But for women, desire precedes arousal, in response to physical intimacy, emotional connection, and an atmosphere free of distractions and everyday concerns. Scientists are continuously exploring the interplay of biological influences, such as neurohormones that suppress or enhance desire, and psychological influences, such as emotions and relationships. Smell plays an often subtle role in attraction; research shows that women are attracted to mates whose natural body odor (sometimes referred to as pheromones) signals a genetic profile distinct from their own. Low sexual desire is a common occurrence, among both sexes, and often it can be resolved by regularly exchanging affection and conversation outside the bedroom as well as in it, making sufficient time for each other and for sex, and addressing conflicts within a relationship.
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