The only time I played strip poker was at the end of a party at a friend's house. He had a
huge house in the countryside and in the summer we liked to go to there to hang out and have fun. One such evening we decided to sleep there, as it was already very late and we had all drunk a bit (not at all excessively, but surely above the legal driving limit). I ended up in a room with the owner of the house, his girlfriend and a girl I had massively fallen for (and who had friendzoned me big time). Out of the blue, my friend proposed to play strip poker. Everyone liked the idea and we started playing. After a couple of rounds, the girl I liked finished all her chips and was supposed to lose an item of clothing. I was obviously looking forward to it but she refused to go through, saying "Oh, I just wanted to understand how it worked... well, goodnight".
I guess this counts... after all the thread is about making a bet, not going through with it.
In case someone wonders, I was never able to get with her or do anything with her at all. In fact, it would be accurate to say that all that my life has become is due to some fairly radical decisions I took after one last talk we had another night while I was driving her home.