Why do some women cry sometimes at orgasm? I'm not sad, quite the opposite, but it has happened to me every now and again with the same partner. I can't explain it to him.

It is normal for women to laugh, cry. It is an amazing experience and crying is a way of showing how amazing it was. Crying is an emotional response to the experience. There should be nothing to explain. This guy should realize that it happens to a lot of women and it is not a bad thing. It is such an overwhelming experience and you have no control over how you respond. Some people laugh, some people cry, and everybody is different and each time is different.

That is all you have to say, why do you need to explain it too him?