At least two that we know of now:

When I was young, and down and out, and in desperate need of income, I did some things that I’m not particularly proud of. I was a whore. I used gay magazine ads and a beeper to generate my clientele, which consisted, mainly, of married men. I had my specific limitations, and my rules were very strict. I never kissed, sucked dick, or got fucked. No matter how poor I was, I was not about to risk getting an STD that I couldn’t afford to get rid of. Here’s the shocker. One of my clients was none other than Professor George Rekers. I had no idea, until this story broke, that this man was the anti gay activist that he is. Now that I am aware of the damage he has caused the LGBT community, I realize that it is my responsibility to set the record straight.... I don’t care what the world says. They can call me a liar. They can call me a faggot. They can even call me a whore. What you can’t call me is a hypocrite. This is one situation in which I definitely take the side of the rent boy. This young man was just doing his job. He didn’t ask to get his picture taken or to be publicly outted. If you want to come after someone who knows that George Reker is a closet case, bisexual man who hates himself and everyone else like him, then you can take my word for it. I’m no longer for rent, and I’m not a boy, but I’m no coward. George Reker is the worst kind of coward, and I hope that others like me, who know this well, will come forward and share the truth about him.

Drip, drip, drip—how many more are there, George?