I guess these are albums that are popular among homosexuals? Which prog rock isn't.
Just because prog rock doesn't attract a lot of babes doesn't mean it's gay, it just means it's nerdy, lets not get the two confused. Prog is a very asexual genre if anything, sexual themes rarely ever come up.
This is a pretty lame list, I can't find any consistancy and don't understand the criteria if there is one. How in the hell is Zen Arcade a gay album? Just because Bob Mould is gay? That's pretty weeeeeeeeeeak.