Oh my fucking God, it's finally happening! You managed to get that sexy someone into your bedroom and they want to sleep with you. As you strip the clothing off of each other, there is a lot going on in both bodies. Not that you are thinking about that at that point in time, nor should you. But here I go again, taking all the mystery and romance out of sex with...science.
Kissing is often a big part of having sex. But why? There are lots of times that people kiss that have nothing to do with sex, yet a kiss and making love are permenently linked. For one thing, its stimulates the body. Nerves in the lips are one hundred times more sensitive than the ends of our fingers. Not even our genitals have as many nerves as the human lips. Some women even report having orgasms from being kissed. There is some evidence that testosterone from a man's kiss enters a woman's mouth via the saliva, making her more willing to have sex.
Then we get to the blow jobs and carpet licking. Robin Baker, author of the controversial book, Sperm Wars, claims that oral sex is a way of testing a lover. The scent of bodily fluids stays on a person's genitals for several hours after making love. By smelling and licking down there, a man or woman can tell if their lover has been unfaithful. It may also test a partner for sexually transmitted diseases. Baker claims that women can tell if a partner has a disease by tasting his penis. Spots and rashes are signs of infection, as is an unpleasant taste. A yellow look to the semen is a bad sign and so is blood. A healthy man should have a waxy taste.
A man can smell the semen in a woman's vagina if she has slept with another man. Oral sex is well known for bringing a woman to orgasm, even if it does take time. (Another old joke. What's the difference between a golf ball and a clitoris? A man will spend hours looking for a golf ball.) The fact that it takes time may be a clue to cunnilingus's purpose. It takes patience. A patient lover may be a better lover.
As for the sex itself,a lot can be said. Positions can help with getting pregnant, like missionary. But cowgirl can still get a woman pregnant, because the vaginal lips come closely together after the penis is withdrawn. (The vagina is more of a slit than a tunnel.) The semen will be near the cervix either way. Even after sex, the seminal pool will slide into a position near the cervix now matter how a woman moves.
There is a reason why people have sex the way they do, with the penis going in and out. The movement makes the penis remove any material (semen from another man, or leftover infertile mucus, which can block sperm's movement to the cervix) like a suction piston. Thrusting doesnt just feel good, it cleans a woman's vagina out. The longer a man can last before he has an orgasm, the more he will clean out the vagina and get rid of obstacles for his sperm. The bigger the penis, the better it removes material.
For women's part, their vagina's can shrink or expand, depending on the size of the man's penis. The average length of a vagina is four inches, and most men are five inches long. If the man is bigger than five inches, he needs to enter her slowly and do a lot of foreplay beforehand to comfort her. If he does this, her vagina can get bigger by 150% to 200%. Few men have penises smaller than four inches.
Its not clear exactly what happens at orgasm. Men will ejaculate sperm at about 28 mph, according to Playboy magazine. Every man will make different amounts of sperm and it depends on how long its been between orgasms. An average man will pump out 450million sperm at one time and 350 million forty eight hours later. Other research says that a woman can determine which man she is sleeping with will be the father of her baby. If she has an orgasm a minute before or forty five minutes after her man ejaculates, she may keep 90% of the sperm in her cervix. With no orgasm she will keep around 50% of the sperm. According to a letter (published in the British Medical Journal) between a woman and her doctor in the 1960's, the woman's orgasm with her lover pulled his condom off of him. When the doctor tried to get it out, it was found in her cervix.
Romantic feelings didn't increase the odds of female orgasm and neither did sexual experience of either partner. Women had the most orgasms with the most symmetrical men during sex. In the journal Animal Behavior, biologists Thornhill and his colleagues found that women with the most attractive (symmetric) men had orgasms 75% of the time. Women with the most unsymmetrical men had orgasms 30% of the time. The average was 60%. The women did not have more orgasms during foreplay. Its thought that women can stay with a wealthy man but secretly have children with a better looking man.
Baker, Robin. Sperm Wars: The Science of Sex. Great Britain: HarperCollins, 1996.
Other facts come from these websites:
http://hss.fullerton.edu/sociology/orleans/symattrct.txt
http://www.psychologytoday.com/articles/199601/the-orgasm-wars
http://www.netdoctor.co.uk/sex_relationships/facts/penissize.htm
http://facts.randomhistory.com/2009/01/22_kissing.html
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