I am bisexual and my thing is I am very open with any partner I have. I have a rule when I am with a guy I am fine with us having a threesome with another girl but I have to pick the girl and there is certain things I look for in a girl. If my guy tries to bring someone to have sex with us than it is probally going to be a no unless she meets every standard I have and yes I am very picky about the girls I let in my bed with me and my man. I have never met a man who has a problem with me having sex with another girl. Most guys have said as long as I can watch or join than they are ok with it. I am ok with it. I guess you just have to open with your partner and see how they respond most girls are surprised to find out how their man reacts. Most guys are good with it though. I guess to them its like having their cake and eating it too.