Fair warning, this story involves cheating on my part, which I'm not proud of and was very guilt-inducing/difficult to work through. If that turns you off, move on. That said, it did involve some very, very hot sex, so I thought it would be a good story to share.
The field I work in has a big annual 4-day conference in a big city. Chicago, New Orleans, Las Vegas. This happened the year it was in Vegas, about 2 years ago. I was 31 at the time.