I watch porn and cum on my own but I don't masturbate to cum. What I basically do is watch about 25mins of porm videos and cross my legs and tighten my legs as it turns me on ad then I have this great stimulation in the end (cum). I have been doing that for awhile. After I do it I feel kind of weird because it kind of hurts not badly but just a little. Is this okay? Have you ever heard of this and is it healthy?