im not saying a big ass. but a nice round one? if you saw one, could you not help but look for as long as possible? is it really distracting? because I know I have nice legs and ass. but I have never caught a guy looking. So what's the deal? do guys only look at their girlfriend's ass or something?
Alas, no, guys don't only stare at their girlfriend's ass. Most guys would stare at any ass in the general vicinity. Though it usually helps when a guys girlfriend has the best ass in town. But yeah, guys might stare. They usually at least peek. But staring is risky. Still, not all guys are like this.
Now here's why they do it. Why it can be distracting.
To explain why guys typically look though, I think it's a part of psychology buried deep. Something very primal, in an almost caveman part of our brains. Big ass, round ass, curvy hips, and other things like that? Caveman brain is telling us that she's a good mate, and can handle childbirth. Anything ass related is usually lumped in with that. Why do we stare? Because it's there, because that primal part of our brain is still there.
you never caught them looking, because they were behind you. They can look away in the time it takes you to turn around.. plus most guys get pretty good at being inconspicuous about it, not like this guy: