I, a straight [M] had my first prostate orgasm a couple of days ago

English is not my first language. But I hope I can make myself understood fairly good.

So here’s the deal, I’m a male in my 20’s who is in a stable relationship with my girlfriend. We do have sex regularly, but never incorporated any anal play into it. My girlfriend is fairly vanilla and doesn’t want to experiment that much. However, I would absolutely love it, and once had a one night stand spit on her finger and ever so gently push it inside me as she sucked my cock. I remeber the orgasm to this day, even though this happened years ago. The way the orgasm kind of started in the stomach region, the way my balls tightened almost to the point that they dissapeared inside me. The ejaculation feeling like multiple orgasms. Her swallowing every single drop as I shot my heavy load in her mouth. And this was without prostate massage mind you.