I think when Perez first discovered Mika for himself he didn't know Mika personally and was not aware Mika planned not to answer questions about his sexual preference.
In one of the first postings if not THE first posting about Mika on the Perez site, he makes a definitive statement regarding Mika's sexual preference. I won't post the link, but if you want to find it, it's out there. How and where Perez gets his info, I have no idea, but there it is.
I'm thinking if Mika was sleeping around (with whomever), somebody somewhere would admit to it, know about it, have seen it or talked about it by now. That makes me believe Mika is not a whore and I like to think that about our dear, sweet boy.
It's been mentioned a couple of times that Mika was influenced by Prince. In the early Prince days there was buzz about his sexual preference and he even references it in his song---I think it was "Controversy." Maybe that's where all of this ambiguity stems from with Mika and he's enjoying the additional buzz. Maybe he just doesn't want to be anyone's political poster boy.
Maybe, it doesn't really matter and who cares anyway.
Frankly, Mika's preferences seem pretty darned obvious to me. If anything, I bet the boy is totally celibate at the moment. Unless he's sleeping with someone he's touring with, when would he have the time?