Has this ever happened to you? If so please explain.

I’ve experienced this twice with my boyfriend. And this last time was so beyond intense. I felt so out of control and out of this world lol and that’s the best description I can give. I literally just had to lay for about 30 min to gather myself and contain myself enough to stop crying lol. I don’t think it means anything bad to cry while having an orgasm, I just would like to know how or what causes it to be so intense lol.