1.Men produce between a quarter to a full teaspoon of semen each time they cum.A teaspoon of said jizz contains seven calories.
2. Short shrift
If unused the penis can shrink as much as 2cm.
3. The biggest human penis ever recorded is more than 34cm (13.5 inches) long
4. Smoking is injuries to your penis
Smoking can shorten your penis by up to 1cm as lighting up calcifies blood vessels involved in erectile circulation.
7. Fun fact.
During missionary sex, the penis is shaped like a boomerang.