Why do women tremble after orgasming?

[hilululu]

It's a question I have. Lately, I've been having sex with my girlfriend and she's been really really enjoying it (I'm her first, and my previous encounters have given me a bit of technique to use). The other day we were getting it on in her bathroom while she was sitting on the sink (don't ask. It just happened ;D) and after we were done, her legs were shaking a lot and she could barely stand. She wasn't in pain (she was laughing) but why does that happen? Am I a powerful sex God that just creates a catastrophic orgasm? Or is it just her?

I'm betting on the latter, because she was extremely loud. I've actually never heard a girl say "fuck" that much while having sex.

Yeah this is kind of a bragging post (I'm just in love lol) but I would like to know why girls shake after an orgasm. :p

thanks!