You know you want to watch what your nubile ma does, but you don't have the energy to ask her. Or you want to ask her, but you are worried about getting caught, or you are afraid that she might say no. Well, now you can be relaxed and know that if she is with a guy, chances are it is just to make her feel special or to boost his ego, but if she is with a girl, chances are better that she is having a threesome with him. If you want to know how to tell if your teen is having a threesome with your son, the best way to go about this is to read this video and follow the tips that follow..