How do I get my committed guy to stop talking about other girls?

Alright, so I've been with this guy for almost a year now. And things are great. But, continually he talks about other girls, its always been look and no touch... and I've been fine with that. Let him have his fun, and as long as at the end of the day he's still all mine I'm happy as a bumblybee. But, lately the stories of pre-me have gotten raunchier and raunchier. I've tried asking him not to tell me, but then... I want to know if he's making such a big deal out of it. there's this one girl he met before I came along, and he had a threesome type thing (not full on sex, but pretty close) and he says she "gets him", understands him when he says things, had the same experiences and viewpoints as him. shes going to be up in his cottage area thanksgiving weekend, and he's sad because they'll only be able to talk. he wouldnt cheat, but he whines about not being able to have sex with her, grope, kiss any of that stuff. I suggested me coming up as well and us all fooling around together, in case maybe hes getting bored. hell, what guy wouldnt go for a threesome? but he said no, it was just wrong. and said he wouldnt, because he liked me better. I don't want to break up with him, but how do I talk about this and/or get him to drop this "other girls" thing?

ONE - a real man doesn't like threesomes.. mine doesn't he'd rather have me all to himself
TWO - If he really loved you he wouldn't be thinking about other girls. My boyfriend doesn't ever say anything about other girls or gets horn horn off them only me.
THREE - Why in the world would you still be with him if this is bugging you??? If he whines about it he probably is gunna do it weather he likes you more or not I mean he's a guy for f*cks sake . your in a cottege alone with a girl hmm what the h-e-l-l is he going to do?
FOUR - I understand you dont want to break up with him TALK to him ok.. tell him it bugs you and say that if he really loved you he wouldn't talk about or look at other girls and conplain he can't "tap" them.
FIVE I'm sorry for any part I sounded rude or b*tchy I just wanted to bring your attention to a few things.