You should see a doctor and stop having anal sex.
If it continues to bleed, show it to your doctor.I came across an article about prostate massage. There are 4 types of massag.Anal peripheral prostate massage. This massage can done by female as well. This massage can strengthen walls of rectum and can fecilitate massage without pain or injury. Google for prostate massage or anal peripheral prostate massage. Harsh friction during the anal sex must have caused some abraison (sp?), causing bleeding. It should subside after some time. clotting takes time.