Because sneaking into a woman's shower to look at her naked is high-LAH-rious:
Hello. I'm a man. And all I need are video games, meat, and sexual gratification from women's bodies. And look how easy it is to acquire all three with very little effort - just the use of my finger. I mean, in the world I inhabit, they're all just there for the taking! (Well, granted, since one of those things involves another human being, I technically need consent. But hey...I'm a guy. We're cute, cheeky rascals. Boys will be criminal perverts!) Isn't life grand?