Why do guys still look at other girls even if they already have a GF?

It is like a natural response, pretty much as a dog would always look at another dog whilst it can walk past a human without looking. Usually we don't even notice it, till the girl actually asks whether we were looking or not and we have to think a bit of what we actually did just now. But I have seen quite a lot of girls do it as well, but they tend to do it to both girls and guys. Girls are less obvious in doing it though because they just use their eyes and guys tend to keep looking forward and turn their face for it. It is funny when you go and try to fight it, for me and many of my friends when doing that it is like you're fighting your own body. The girl hasn't even walked passed you yet but is just behind you or directly on your side still and already your face wants to turn but you focus on looking forward giving the feeling as if something is trying to turn your head aside.

Good question... well I don't know the answer: if I'm in love I see only my girlfriend... maybe they don't love so much?

There is nothing wrong if your boyfriend is looking at another girl. I would start worring if he wasn't. My son is married and my husband and I have been married soon to be 35 years and I would worry about him if he wasn't checking out the other gals. They don't mean anything by it. They can not help themselves. If you are secure in your relationship it would not bother you. Question: Don't you check out other guys? Be honest about it. I still check out other guys and I have been married for 34 years.

i think its normal. it is, in my opinion, wrong for the boyfriend to be checking out other females in front of his girlfriend. we are humans, not animals, we can control our actions. so, a guy should respect his gf or wife, and not do it in front of her. if the guy is doing it in front of her on purpose,just to get her jealous, then the guy needs to grow up. so yes, it is normal and natural to look, but there are times when it can and cannot be done. by the way, what is wrong to admitting if we are jealous? i will never understand why so many people deny this feeling. when i first started dating my husband, i warned him that i am an extremely jealous person. i wasnt about to have him find out the hard way. he has tested me over time, to see what he can get away with. now he knows the boundries. we have avoided many many arguments with me just telling him straight out how i really feel.

I think it's a natural reaction. If they don't, it's like saying they don't find women attractive.

I dunno, I never did that. When I was with my girlfriend and any girl passed by me, I didn't turn my head. That sucks! Some guys are just stupid to the point of doing that to check the other girls. Some are only trying to make his girlfriend jealous, though.