so, i have a friend who talks about sex and girls about 90% of

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so, i have a friend who talks about sex and girls about 90% of the times we hang out. i never really say much because i have a girlfriend but something confuses me. he'll speak on a girl like say Megan Fox, saying she's attractive and how he'll fuck shit out if her. but when I speak on a girl, like say, Scarlett Johansson. he'll say I'm disgusting and repeatedly bother me about it, usually when I only really say "Selena looks cute" or something. every girl i say is apparently ugly and every girl he says is just hot. kinda offends me, even if its a bit petty. just that he gets super serious about it and is kinda always making it a topic to talk about girls. I find it really stupid. any idea what is up with him?