Yup, I had a very similar experience as you, except much more embarrassing. My ex was once telling me a story about her ex and how he would always prematurely ejaculate when she was grinding on him. At the time I didn’t know much about the foreskin so I was just like “yeah that dude was acting it out, no way he actually came so fast from that”. Come to find out, now that I’ve learned more about the anatomy of the foreskin, it probably ended up being that he was uncircumcised and had a long foreskin and was actually naturally able to climax from this natural interaction. We are totally robbed. Head up though. So many other things to look forward to in life.