Sex: Prologue despite the name has nothing to do with the act of sex, but instead is an 1 minute and 47 second (1 minute 31 seconds if you subtract the credits) mostly black and white animation. There's not really much else to talk about. The loud music changes volume quickly, making my ears bleed. The story is hard to crasp with such a short runtime and fast pacing. Atleast the animation is pretty good, but even that doesn't save much face. The only people who should check this out are the ones familiar with the manga, but I doubt even they would get much enjoymentout of this.