Picture Tammy Fay Baker. Or Janet Reno. If that doesn't kill your urge to come, nothing will.
But seriously, I have found that the old baseball thing can work too. I was banging a chick today, and felt the urge building. For some reason, the image of Willie Stargell of the '79 Pirates popped into my mind, and I was fine.
You are 100% correct. He tried to go first to third on a single, his jacket blew up like a balloon and he was a dead duck at third. I can still picture the blood when he took to the mound after that.