Last night over dinner my daughter said, "I'm going to go out to dinner tomorrow night with some girlfriends after we finish up at the barn (she rides her horse, Blues, almost every day)."
My son then said, "I'm going to meet some guys for b-ball (basketball) tomorrow night."
He then said, "How come it doesn't sound right for me to say I'm going to meet some boyfriends for basketball."
I couldn't think of anything to say other than "you're right, it doesn't sound right. For some reason, you need to stick with some guys or some dudes."
It just seems to roll off the tongue so much easier and doesn't cause anyone to have any second thoughts along the lines of "what did he just say?"