Well, he looks really happy (and disbelieving) during her orgasm, but when she sais "Peter, the orgasm's I've had with you were great, but this was really crazy", he doesn't seem all that amused anymore. And why should he? Outperformed by a circus ride! I'll bet you that he is now at home, drinking way too much beer, and she is still riding that ride.
EDIT: And I have now realised that she doesn't say "I WANNA have an orgasm", but "I'm GONNA have an orgasm".
Overanalyzing? Watching the video way too many times? Guilty!