What is your biggest sex fantasy? And have you ever done it? Most men would say a threesome, mine is to watch my so have sex with another man. For some reason it turns me on to think about it. We were watching an amateur porn show (dont remember what it was) and for the ladys birthday she got to fuck another man and her husband watched. Ever since then i wonder what it would be like to watch my wife with another man. Even though it would proablly never happen. What is your fantasy??