what is the hole in men's underwear for

what is the hole in men's underwear for
 
 
 
 
 
 
 
 
 
Athletic Supporters
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Athletic Supporters
 
 
 
 
Nylon 3in Boxer Briefs No Fly 1pk Black - White Stitch
 
 
 
Nylon 3in Boxer Briefs V-Fly 4pk Black
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