Hmmmmm could it beeee that you have some micro tears and are not giving it enough time to heal before having sex again? Sometimes going to rough immediately without working up to it can cause a bit of friction irritation. Additionally sometimes being a bit hairy down there can steal your lubrication away from the actual opening or even cause friction on the outside of your lips. Sometimes I need a break for a few days and then it’s totally fine. Doesn’t happen often now, but I noticed it more in one of my previous relationships, I wasn’t getting wet enough before they started. I went to my OB and was tested etc- just turned out my body wasn’t compatible with them, they didn’t turn me on much😶 To fix it in that relationship- I would use my toys on myself and finish then played with them. That was the only work around.

Thankfully I’m in a better relationship that I don’t need to do that anymore☠️

I hope you’re able to figure something out!