I've definitely had this, and experienced bleeding too. I always knew I had endo from the time I heard about it at about age 12. I tried researching this symptom when it popped up in the past few years and there's not a lot of people talking about it. I discussed it with my gyno and it's super common with endo, orgasm triggers the same muscles used during our period so the cramps are kind of like aftershocks.

Yes I have had this experience!!! It took years to get diagnosed, I paid to see a fertility specialist privately and during investigations I was diagnosed. This seems to have cleared up for me, only since having a baby though, which I know isn't possible for everyone, and isn't a cure for everyone. It was absolutely a symptom for me, don't worry about advocating for yourself and getting other opinions. Good luck.

glad to know i am not the only one dealing with this! do you bleed as well?

I don't have sex because the last time I tried I felt sick with pains in my stomach within seconds... I am also trying to figure out if I have endo so I understand...

You should look into Vaginimus. I have a lot of pain as well as it turns out Endo wasn't the only culprit. The specialist I saw suggested botox injection to the vaginal muscles.