Why do guys in relationships still check other girls out?

My boyfriend admitted that when he is just with the guys (all of his friends are single) they all talk about girls they think are hot. I wouldn't mind as much if it were celebrities they were talking about but he said it's girls they know, girls who go to our school, etc. It makes me feel uncomfortable knowing that there are girls he sees everyday at school that he supposedly thinks are hot and talks about how hot t hey are with his friends.

do all guys do this? why would a guy in a serious relationship who loves his girlfriend go and talk about other girls he thinks are hot?
Why do guys in relationships still check other girls out?
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