It is common for men to wake up with "morning wood," a name for a morning erection.
The first condoms in the U.S. were made in the 1870s from vulcanized rubber. They were expensive, thick and intended to be reused.
The world's only museum of Phallology is in Reykjavik, Iceland. Phallology is the science of the penis.
Ever wonder why it is difficult to urinate immediately after having sex? That's because when you orgasm, an anti-diuretic hormone is released in your body.
A woman's clitoris contains over 8000 nerve fibres, almost the twice of that of a penis.
About two tablespoons of blood is required to get a penis erect.
A man approximately ejaculates 17 litres of semen in his entire life that contains about half a trillion sperm.
A sperm can travel up to 7 inches in an hour's time.
Walruses masturbate by rubbing their penis with their flippers.
In France in the 1500s, women could charge their husbands with impotence. He would have to become erect and show he could ejaculate in a courtroom. If he failed, he could demand a Trial by Congress and attempt to have sex with his wife in front of experts.