Penis Positioning System (PPS) is the system whereby "Mr. Penis chooses his own position". That is to say that your penis decides where you go (and who you do). Penis Positioning System is named for Global Positioning System (GPS).
Ed: Dude, I don't know what I was thinking.
Al: Ask Mr. Penis, he chooses the position.
Lee: Oh man, I was using my Penis Positioning System last night, that's for sure.
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