"The Real World" houses have always been a hot bed of hot hookups -- but one former star just revealed he had a secret tryst with a guy who's "straight."

Danny Roberts, who starred on "The Real World: New Orleans" and later competed on "Real World/Road Rules Challenge: Battle of the Seasons" came clean with his little secret on Wednesday night's "Watch What Happens Live."

Check out the admission below -- think you know who he's talking about?

Later in the show Danny admitted that he got a nasty phone call from "The Real World: Las Vegas" cast member Trishelle Cannatella -- who apparently dated his secret lovah.

We don't know for sure who he's talking about, but last night Trishelle tweeted who it isn't.

"not Steven. Danny also cheated on his bf at the time lol," she posted ... only to delete the tweet later.

You can do the math from there ... but she's been linked to a few cast members through the years.

Robert also revealed he's a married man now too, adding that he still talks to BFF Kelly Limp on a regular basis.

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