I think it is perfectly fine, but the relationship you may have with another female who is NOT apart of this group might feel otherwise, best to let them know ahead of time to see if they can handle it...With me and my boyfriend it is the same thing he has alot of girls that are close friends which sometimes I get jealous of when they text him before he goes to sleep at night, but I realize that it is the same way with me...I have alot of guy friends rather then girls because I find them eaiser to talk to because they are of the opposite sex and their is less clashing and ego trips...