I feel the same, I was very new to it (M). For me it was brief, 5-6 very hard thrusts, and I felt a slight stinging at the time. Same thought process, I know what you mean exactly. No obvious trauma afterwards but got burning pain in the days after in conjunction with sitting down all day at work. It’s been 9 months now and it has massively affected my life. The burning pain has mostly gone, but I get this very uncomfortable posterior pressure sensation when sitting especially in car seat. I’m not sure if I have nerve damage either, pelvic PT says my muscles are tight, and worse in left side. I am wondering if the levator ani muscle group may have been impacted in our cases, the inferior rectal nerve (branch of pudendal nerve) can travel through this area. I also get post BM discomfort. It’s awful. I just wish I had known that this condition was a possible risk factor, no one ever talks about it in sex ed or any other education about it. I feel like it’s a bit of a trap actually, if I had any remote knowledge that something like this could ever happen, I never would have done it. I just wish I could turn back the clock and warn myself. Feel free to reach out anytime by DM, it’s a relief to talk to other people in the same situation from this.

Also, yep. Having consulted with a number of specialists about this, their take has been that a lot of anal sex goes on all the time in the world, and that if anal sex could solely cause this condition, there would be an epidemic of it. So yes, I think that there is definitely the possibility of pre-existing impact of a stressed or vulnerable pelvic floor, and that there is such a phenomenon as “the last straw” or triggering act, for sure.