How Parents Tricks Their Son's GF Into 3some Sex? If you are a parent or a close friend of one, chances are you have wondered just how this happens, or why it happens so often. Well, I can tell you and explain it to you. There are many factors that come into play when your son's girlfriend tells her boy friends that she wants to have sex with them. Read on to discover what these factors are and how you can best convince your son's girlfriend to give it to you....