A Handy-Dandy Guide to Penis Pumps: For Men

Testicles
Sistine Chapel, fresco
Sistine chapel
Michelangelo, Vatican 1509

The other big part of your package is the family jewels. We will take a look at them too while we're at it. Your nuts (testis) and the sack they're housed in (scrotum) are an evolutionary marvel. Your testicles are about 4oF cooler than your core body temperature. Lucky for us, this is the ideal climate for healthy sperm production. 90% of the male hormone, testosterone, is manufactured in our balls. Evolution has even provided that one nut, generally the left, hangs slightly lower than the other. The lower nut will also be slightly larger. I suppose this is to keep them from knocking into each other so much. Ball stretching (Editor's note: Look here at Ball stretchers and dividers) is all the rage these days. Many aficionados of ball manipulation swear by the pump (the whole reason for writing this guide); but again, I don't want to get too far ahead of myself.