Zero Man vs. The Half-Virgin

A man with no memory finds that he has a very strange superpower that makes him see numbers on people's foreheads when he gets an erection. He tries to figure out the mystery of this power that may have to do with sex, except the power keeps giving him new mysteries to solve, including a woman with 0.5 on her forehead that progresses to 0.7, a little girl with 13, a man with 55, and several people with zeroes that shouldn't really be zeroes, including himself. (The Worldwide Celluloid Massacre)