The logic that allows girls who are saving their virginity for marriage to instead have premarital anal
intercourse.
Typically the boyfriends of such girls will convince them that, if they
take it in the ass and don't
pop the cherry, they're still pure and virginal.
Guy 1: "I'm bummed because this
hot chick I dated is saving herself for marriage."
Guy 2: "Just explain the poophole
loophole to her and you'll score for sure."
Chick: "Thank goodness for the poophole
loophole. Now I can honestly tell God and my parents that I am a virgin."