Ever since I was little, like elementary school I've done this: lay on my left side (I can't do it on my right for some reason), put a blanket between my legs and I rub it back & forth, squeezing my legs super tight. I can cum in one min doing this & a couple times in a row. It feels amazing, but no other mastuebating works (except for vibrator I tried that last night it was wonderful) & I can't cum during sex. 

Does anybody else do this or am I a freak? It feels amazing tho you should try!!