All the people you named have been seen with the opposite sex too. In an interview Elton claimed to be bi. Rod Stewart has had romances with babes (if you believe the tabloids) and he was also in the hospital to have his stomach pump (many years ago) for sucking too many cocks in an evening.
In an interview (don't ask me to site it - that would take some research) Hef himself was asked if he ever tried gay stuff, his response was "let's just say in those days we experimented a lot". So if you ever get to meet him, you could ask.
I think Elton while he may be bi, leans towards the guys. I still enjoy his music. Wouldn't stop me from buying a CD or going to a concert. Same with Rod and the rest. Not homophobic, are you? You did so well with the solo girl sites, how about solo twinks?
BTW - I hope I don't have to mention that it would not be polite to ask Hef if he is gay. He may take it as a pass and you could enjoy a whole new experience in life.
Donny didn't give ya enough shit in this thread, so I'm just giving you shit for grins. Enjoy Thanksgiving if you celebrate it.