99 sex facts no one's ever told you: there's a whole wide--and wild--world of naughty knowledge out there that even a carnally curious chick like yourself hasn't been clued in on. For an erotic education, read on.

(1) You've probably heard that it takes 20 minutes for a woman to get amused. But using thermal imaging of people's bodies, researchers at McGill University determined that women get amused as rapidly as men do--in about 11 to 12 minutes.

(2) Research shows that lying down can dampen sensitivity to smell and sound. So missionary is not going to be as multi-sensory as a position in which you're able to sit up.

(3) A survey by the Family Planning Association in the U.K. found that condom failure often occurs because the prophylactic is too big (and winds up slipping off) or too small (and winds up tearing). So take his ego out of the equation and make sure his rubber fits like a, er, glove.

(4) Scatophilia: sexual gratification from talking about naughty or obscene matters with a stranger, often by telephone

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In Uganda, many young women pinch and apply a mixture of herbs to their labia to elongate them. They believe men find this attractive.

(6) One unconventional way to prevent pregnancy: Get your guy some polyester undies. According to research, men who wore polyester underwear became temporarily sterile, possibly due to abnormally high testicular temps and electromagnetic fields.