Here's some Real World news that will blow the minds of people who were into that shit circa 2000/2001: Danny Roberts (the most universally-appealing gay man in the world) admitted to having an affair with a straight male cast member years ago while filming The Challenge. After the hints he dropped, it's pretty clear that the guy was either Mike 'The Miz' Mizanin or Adam Larson.
Danny and some other former Real World-ers were on Watch What Happens Live together last night when they were asked by a caller who they hooked up with while filming various seasons of The Challenge. Danny said that he couldn't answer because "he's straight and married now." Later in the show, he revealed that he received an angry phone call from Real World: Las Vegas alum Trishelle Cannatella about the incident, because the guy in question was her boyfriend.
Trishelle has hooked up with three dudes in The Challenge universe: Steven Hill, The Miz, and Adam Larson. All three of them are married, but Trishelle denied on her Twitter account that it was Steven. So that leaves Adam and The Miz. (Additionally, they both filmed seasons of The Challenge with Danny.) Happy guessing!