Rain and thunder (hard rain splatting on the air-conditioner housing adds a nice touch).
The first climax of a triple-header, when it's real easy and feels like ground zero at a thermo-nuke detonation, or the third, when you have to work your ass off for a little ripple of pleasure - but you GET THERE?
Well. I am (as previously noted) an unabashed and unrepentant tit-man. But when a friend, talking about a woman's body, says "She had an ass that would stop time!" I know EXACTLY what he means!