I'd like to know WHY too--since it could be anything from "no problem" to "get yourself to a urologist."
There are several possibilities:
1. The anal sphincter is very tight (otherwise we'd all be walking around very embarrassed!), and easily torn, especially if you're not relaxed enough or lubricated enough for penetration. So the blood on his penis might have been from a small fissure or tear in your anus.
2. He may have an undiagnosed disease or other medical condition, and be experiencing bleeding from his urethra.
3. He may have injured his penis.
Bottom line: don't have anal sex unless you're very relaxed, turned on and sufficiently lubed. If he's the one bleeding, and it continues, he should see a urologist ASAP. Dr. J
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