"Sex 101"

This week's OMGFactsSEX stats:

* There are 20 times as many male masochists than female masochists.
* Middle aged men take an average of 5 times as long to get an erection than younger men do.
* On average, unmarried cohabiting couples have sex an extra 40 more times than married couples do every year.
* Over 200 Americans have sex changes every year.
* According to Kinsey, 75% of men ejaculate within 3 minutes of penetration.
* An extramarital affair usually lasts 21 months.
* The average prostitute stays in that job for 5 years.
* A rhinoceros can ejaculate 10 times in a half-hour lovemaking session.
* Since the 1940s the percent of married women who were unfaithful has gone from 26% to around 40%.
* Marilyn Monroe was paid only $50 for her 1949 nude calendar photo.
* 55% of lesbians have heterosexual dreams.
* 30% of U.S. males have had a homosexual encounter.
* Only 48% of men say their wives are skilled lovers.
* 30% of women over 80 still have sex.