The 72 hour rule is in reference to the amount of time you are supposed to wait to contact a girl, after you have had coitus.
The purpose of the 72 hour rule is to have the girl lose feelings after you muck her barn so you don't have to have any awkward conversations and you wont directly have to be a dick to her.
The 72 hour rule was first implemented by Jesus Christ, who waited approximately 72 hours to rise from the grave after everyone though he had been killed.

-48 hours is not near long enough as the girl you fucked might still be holding out hope.
-96 hours is too long as what you are doing becomes too obvious and she doesn't need to know what you are doing

On the first day she will still have strong feeling
On the second day she will be sad you ghosted her
On the third day she will just be pissed off

This is why we use the 72 Hour rule.
Guy1: Bro, did you fuck her last night?
Guy2: Yah I think i’m gonna text her and tell her I don't want anything serious, but thats gonna be hella awkward
Guy1: Bro, Just do what my dawg Jesus did and use the 72 Hour Rule!
Guy2: Thats great advice! Thanks!
by JewЬоу33 January 26, 2020
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