I have a girlfriend, and we have sex regularly. I have a 9-inch d*** and it has been chased after by many a girl. I’m trying to go one at a time right now but the girlfriend has been asking for more. We do oral sex usually but lately she has been pushing for a threesome, maybe invite on of her female friends or something. She does have a few very attractive friends, but i don’t know if i am ready for a threesome yet. Any advice?