do orgasims burn calories?

Hey,
I have one question. Maybe sounds funny, but do orgasims burn calories?

I heard somewhere that you can burn 200 calories during one orgasm : ) so, do it ; )
However, I think sex is better way to burn calories. Especially, if you are very during sexual act, meaning moving a lot. For woman is for example better (when she is on top) to be on her feet and not on the knees… that way woman makes good exercise for her legs.