Confusing sex with jj

Appearently it's normal to get confused about sex when you're doing jiu jitsu. I've heard a lot of guys talking about finding themselves in situations when they are grappling, where they suddenly look up and think "this is what I've would have been doing if I was screwing". Right. And thats the response I get when I ask folks if anyone have it the other way around.
I never think about sex (which might disturb me if someone I was rolling with were like "hah, it's like you're doing me!") doing jj, instead I can't help thinking about passing her guard or finding myself getting wrist control when I get down to business.

Clearly nobody else I've asked feel me so I just wanna know how big of a freak I am. - does anyone else do that?