What’s the average size of a guy’s equipment? Where can’t you buy “marital aids” – and speaking of sex toys, why do some Japanese ones have happy faces on them? Get answers to these and seven more sexy questions you probably never thought to ask here!

Top sex facts

A recent visit to Manhattan’s legendary Museum of Sex yielded more than a mob of 18-year-old girls giggling in the foyer – it provided an entertaining and educated look into the history of sex.

Here are some little-known sex facts that may surprise you – or at least give you ammunition for a fascinating dinner conversation!

The best medicine…



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According to the Museum of Sex, the vibrator was originally used as a medicinal treatment for female “hysteria” during the 19th century. The vibrator-induced orgasms helped doctors dissipate hysteria’s anxiety-related symptoms.

Check out Top 10 sex positions >>

Say cheese!

Semen contains zinc and calcium, both of which are proven to prevent tooth decay.

Hop to it

The iconic “Rabbit” is renowned for two things: excellent orgasm results and an odd smiley face on its tip. Women’s Health tells us the smiley face was actually a result of conservative Japanese customs. Apparently, Japanese consumers frown upon “the production of sex toys that too closely resemble phalluses,” so the smiley face was added.

Learn how to introduce a sex toy to your love life >>

Does he measure up?

The average size of an erect penis is five inches, and the average flaccid penis measures about 3 inches.

Find out: Does penis size really matter? >>

Up next: More sex facts >>