is it reasonable to expect that a bf reduce his chumminess with his female friends when he gets a GF?

very reasonable, the flirting and inuendo that comes with a lot of girl "FRIENDS" is totally inappropriate now, you should have made your choice, you can only keep the ones who are JUST friends, you know the ones, they are the ones who the both of you can hang with and act the same way when she is there!!!

In an ideal situation, the girlfriend should be able to hang with the friends too. Yes, there would be some alone time for the couple but don't try to control his life or dictate his time.

There will be a time for him to spend time with his girl but that doesn't mean he can't hang out with his girl friends just because he has a girlfriend. She can join him although he should have the right to spend time with them without her. She has to be able to understand and trust him. She shouldn't control his life. He has his own life to live as well.

Why would he need to hang around a bunch of girls unless you were with him too ? I think out of respect for you he should not hang around women all the time . Yes he should speak to them and be nice but not hang out with them ! He's with you now and doesn't need to be hanging out with all the girls all the time . But you both can still have them as friends .

Angel

In a perfect world no, but reverse the roles and you probably wouldn't agree to reduce seeing any male friends you have.

Depends on if you just want to be " one of the chums " ? Or do you want to be someting more ?