I have always been masturbating the same, but recently, I’ve been heavily bleeding immediately after I’m done. I often don’t climax when I masturbate, and I’ll bleed the same no matter what. It’s always very heavy, and immediate. The blood is also always very dark and sticky. I’m a virgin as well. I also have always had problems with my menstruation, with very irregular painful periods, so I’ve been on birth control (depo shot) since I was a teen to help. What is the problem? Could it be a tumor or fibroid? It’s rather distressing because there’s always a ton of blood and I bleed for about a half hour after.