Watch | 10 amazing facts about the penis you probably didn't know
You probably know all there is to know about what's going on downstairs, but what about the world's penis population at large?
Well luckily YouTubers Alltime10s have found some of the ten most amazing (and in some cases properly eye-watering) facts about men's most beloved body part - from how many of us are secretly harbouring TWO penises to the exact speed that semen is propelled from the body.
Thinking about trying to break the world record for furthest ejaculation? Find out how many feet you've got to beat below...
More stories:Four erectile dysfunction myths debunkedMen who watch more porn have better sex live, study says