Five Sex Facts

1. It's commonly repeated that men think of sex every seven seconds. In actuality: 54% of men think of sex every day or several times a day, 43% a few times a week or a few times a month, and 4% less than once a month. (Source: Kinsey Report (Sexual Behavior in the Human Male))

2. The instant a woman enters a secure relationship, her sex-drive begins to plummet. Four years into a relationship, fewer than half of women want regular sex; after 20 years, only 20% want regular sex.* Male libido stays steady no matter how long they've been in a relationship. (Source: Sexual Motivation and The Duration of Partnership; Dr Dietrich Klusmann, Hamburg-Eppendorf University Hospital)

2.5 The desire for tenderness shows an opposite trend, however. After 10 years in a relationship, 95% of women crave tenderness while only 25% of men said they hoped for the same from their partner.

3. The average penis size is between 5.08 and 5.3 inches. (Sources: Journal of Urology, International Journal of Impotence Research)

4. HIV isn't as easy to spread through heterosexual sex as many think. Men almost never get HIV from women. A healthy man having unprotected sex with a non-drug-using woman has a 1 in 5-million chance of contracting HIV; with a condom, the odds drop to 1 in 50-million. The odds an HIV-positive man will transmit the virus to a woman are less than 1 in 1,000. (Source: Journal of the American Medical Association)

5. Unlike what you might see in the movies, the average sex session lasts from 3-10 minutes (the average hotel porn viewer watched for just 12 minutes). (Source: Kinsey Report (Sexual Behavior in the Human Male))

* An evolutionary explanation to this phenomena is that female sex drive is initially higher to facilitate pair bonding.