I did hear it is more likely to happen with multiple orgasms...and I tend to just have a really strong one and then I am more like a guy, "over it and goodnight", whether not in a relationship (like at the moment) or when I was with someone (please no talking, shhh).
I am envious though...I had a guy ask me once (who I was going to become intimate with) if I could do it and I was like "NO". I think I probably hissed it. I am irritated I haven't been able to. Grr.