Certain species of animals also have sex for other purposes than to bear offspring. These include Humans, bonobos, chimpanzees and dolphins. These species also are among those known to engage in homosexual behaviors. In both humans and bonobos, the female has a relatively concealed ovulation. Neither male or female partners commonly know whether she is fertile at any given moment. One reason for this may be that sex partners of these species form strong emotional bonds. The partners come together for more than just sexual intercourse. In the case of humans, long-term partnership is more important than immediate sexual reproduction.
Technique: She lies on her back. You kneel between her legs and raise them, resting her calves over your shoulders. Rock her in a side-to-side and up-and-down motion to bring the head and shaft of your penis in direct contact with the front wall of her vagina. Because this angle allows for deep penetration, thrust slowly at first avoid causing her discomfort.
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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.
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". 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).
The pleasure of sex arises from many factors including the release of neurochemicals such as oxytocin and dopamine, which flood the system during orgasm, as well as the sense of connection communicated by touching, massaging, and cuddling. Given the enormous variability in activities that people find arousing, there is no one way to be sexual. Men are especially stimulated by visual imagery, and about 90 percent of young men report using pornography with some regularity, often because they lack a partner or don't know how to bridge the differences in sexual appetite and interest that can occur between partners in the absence of discussion of their sexual pleasures. Many people engage in behaviors that were once perceived as atypical, such as dominance play and anal intercourse. Researchers know that flexibility in sexual repertoires is healthy and generally enhances relationships; they regard a specific behavior as problematic only when it creates harm or distress for one or both partners or when the behavior is compulsive—that is, it becomes the only means of arousal. "Sex addiction" is a label often used to suggest excessive interest in sex, but studies show it may be more related to the moral/religious environment in which a person lives.