Here's a story that kind of takes the question to the next level --
A close friend lost his husband last year (cancer). They had been together, and happily so, for 25 years. Soon thereafter (about a week) he mentioned to me that he had been faithful for all 25 of those years, but was damn horny after several months without sex. He hooked up with a guy via GROWLr, had a great time with him, and about six weeks later let me know that things were getting "serious."
Four months after they met they got married.