Why do female parachutists have to wear tampons before they jump?
So they don't whistle on the way down!
Female Parachutists and Tampons
Explanation
Explain Bear
Listen up, buttercup! This joke is about how when the wind blows through a small hole, it can make a whistling sound. The joke is playing on the idea that a woman's... uh... lady parts... might whistle if she didn't wear a tampon while skydiving. You probably didn't know that, because you don't know nothin'.