A
non-written but universally understood law
stating that what a man does for a woman during
coitus, she must do for him in return.
Bro
1:
Dude, I hooked up with this skankbag I met on
Tinder. I went down on her and she refused to fellatiate me back.
Bro 2: Did you explain to her Poundtown's Law of Reciprocity?