Happy camper

I've been told that after both people participating in the sex (me being one of two on a good day) have gotten off, I laugh. And I don't mean laughing as in cracking a smile - I mean, when I'm having sex all I do is smile. But I actually laugh - out loud - really hard. And it doesn't happen when I'm alone...you know...having the sex by myself.

Seriously, what the fuck is up with that?