Haven't yet...God, help me, I hope I never do.
BTW, I cannot judge or condemn anyone who has...my wife is wonderful, a real beauty and 110% intellectually stimulating...she's got it all. But even so, I've been tempted before so bad it scared the crap out of me.
The best thing to do in those situations if you have your wits about you, I found, is to literally turn and run away. I did that the last time, and it worked...I said nothing, just set down my drink (a coke) and bolted for the door. Bitch didn't even care that I was wearing a wedding ring.