V. Ejaculating on a woman's chest after sex, turning all the lights off and shining a UV light on her chest, which will cause the ejaculate to glow, much like the arc reactor in implanted in Tony Stark's chest in the popular Marvel comic Iron Man.
Guy 1: Milly was wondering why I put a UV light above the bed yesterday. Tonight she's in for a surprise.
Guy 2: Haha, dude you should totally send me pics of you iron manning her!
Guy1: No. That's just weird Chad, get a girlfriend already you huge creep.