The wisest performers know that the sooner we get the money shot,the sooner they get their check, shower and what have you and they are compliant to the shortest route between points a and b but sometimes....
Funny story...
I'm shooting for Jim Lane with a cool chick whose lesbian girlfriend is her driver and standing quietly off-cam through the scene...most of Jim's shoots go an hr and a half like clockwork.. he is a machine.(gets more done before 4pm than most people do in 3 days) This day he is using a different stills guy other than his usual masked man

any way Jim has several scenes working at once and the stills guy has to interrupt us and over shoot to make certain he has everthing he needs... This runs us overtime ..I am tired the lesbian lover is making boo boo faces at her lover and now we are thirty seconds away from finish..I reach for this chick to get an edge to finish when all of the sudden....
SHE SCREAMS AT THE TOP OF HER LUNGS HOW I NEED TO GET THE FUCK OFF OF HER BECAUSE SINCE THEY PAY ME MY ERECTION IS NOT HER FUCKING RESPONSIBILITY!!!!!

I was so rattled at that point and wanted to be naked next to her about as much as I would like to hold a rabid raccoon to my junk..
I had to leave the room and jerk my self to the brink.. run into the room pinched off and drop it on her to get paid!