...cause dumbass Eric didn't, and still doesn't after i explained it.

Superman is flying around one day erradicating crime and what-not when he sees superwoman lying butt-naked and spread eagle on top of a sky scraper.

Superman thinks to himself, "Hey, I deserve some fun more than anyone. And since i'm superman, i can do what i want before anyone notices..."

So he swoops down, does the business and flies off before anyone realises. After which, superwoman says, "What the hell was that?!"

To which the invisible man replies, "I dunno, but my arse is killing."