1. The typical lovemaking session lasts around 15 minutes: roughly 10 to 12 minutes of foreplay and around 3 to 5 minutes of intercourse.
2. Humans aren't the only horny members of the animal kingdom doing it just for fun. Dolphins and a type of chimpanzee called the bonobo have also been observed engaging in sexual activity when they are not in their natural reproductive cycles.
3. While Viagra has made erectile dysfunction (affecting 10 to 12 percent of men) a household phrase, the opposite problem -- premature ejaculation -- is more common (affecting 24 to 27 percent of men). The U.S. Food and Drug Administration is currently reviewing a drug called dapoxetine as a cure for this problem.
4. Crank up that thermostat... orgasms may be more intense in warmer conditions. The degree of vasocongestion, reddening or darkeing of the skin known as the "sex flush," is both more common in warmer temperatures and an indication of how intense an orgasm may be.
5. If a woman experiences orgasm during sex, she is more likely to become pregnant, since orgasmic spasms in pelvic muscles help move sperm up the vaginal canal to the uterus.
6. Homosexuality is not unique to humans. Many species have been observed engaging in homosexual activity, and in fact male bats have the highest rate of homosexuality of all mammals.
7. On any given day 400,000,000 people around the world -- 1 in 17 of us -- will have sexual intercourse. Broken down further, 4,000 people are having sex at any given time.
8. Sex cures headaches. Endorphins released into our bloodstream when we have sex not only give us pleasure but also act as painkillers. Useful information to whip out the next time your partner uses a headache as a reason to say no.
9. Many elderly can and do have frequent sex. At age 70, 73% of males are still potent, and 30% of women 80 or older have still have sex.
10. 70% of women would rather eat choclate than have sex.
Sources: The Kinsey Report, Wikipedia, American Urology Association