I was having sex with my fiance, fairly rough, when we went to move to a different position we noticed blood. after we realized it wasn't from me, we looked and it was coming from his penis. but he didn't ejaculate and he wasn't cut. it was almost like it was coming from the pores? was there too much pressure build-up? or is there something wrong we should be worried about? it hasn't happened since but then again we've been taking it easy and not being so rough. should i be worried or was this a one time thing?