Wearing boxers while playing ball?

Question

My uncle tells me that after a while playing basketball or any other sports in your boxers will make your balls sag painfully. Is that true? He said that because your balls are not held in place and when you jump up and down your balls jiggle roughly. After a while he said your balls will hurt and sag Can someone confirm this for me?

Answer 1

It makes sense to me. If you wear boxers, use a jock strap.

Answer 2

Sorry, not a clue. Long distance runners don't report much problem, and their boys get jiggled around something fierce.