Caution. Sensitive explicit content. Is it sexual injury or std? Sometimes it's hard to tell. In this case it was a friction "sore" & soreness. Like rug burn on your knees you notice only after sex. Like chafing when wet clothing rubs against your skin. Like a blister when the shoe rubs against your foot. In this case it was my penis rubbing against his anus. I take full responsibility. I was too rough & didn't follow our LUBE safety protocol. Yes we have one. Step 1. Lube it with ky. Stick it in slowly. Lube is instantly absorbed. Step 2. Re Lube. You can stay in a little longer. Step 3. Re-Lube including the tip. Now you can go a couple minutes more firmly. Unless you're a sex athlete in a porno, you & your bottom can't last until Step 4 staying moist. Think about the water-based lube. When it dries out, it's sticky. Imagine your bottom's inside is sticky as you penetrate. He said these words "You hurt me". I'm so moved ...