I actually think that Jack the Sailor pretty well answered the question first posed.

The reason gay males aren't attracted much to folk music is that 1. It isn't culturally what attracts them at this point. Stereotype but true, they tend toward pop, glitz, OR hardcore----I mean, heck, they were instrumental in defining our pop music and culture (as someone before me pointed out). As the MAJORITY of them (Fred Small notwithstanding) are not interested in the "folk scene" the rest don't go there because the pickins would be pretty slim (when looking for potential sexual partners).

Lesbians, on the other hand, are women who by nature and desired appearance, do not care to fit a societal norm. The folk scene attracted a few, very talented women and that signaled that they might find a comfortable home in the folk scene---as well as other like-minded women with whom to "mate".