The 'provocative' Folsom Street Fair official poster brings to mind the question of why leading figures of the 'gay rights' movement so consistently confirm putatively negative stereotypes about the gay lifestyle (the event isn't explicitly gay-oriented, but gay men comprise the bulk of those participating). Imagine if a group of La Raza council members publicly leered at middle school girls on their way to class or if Al Sharpton led protesters in Jena holding a sign that read "Not jus' Jena, we bustin' yo' sorry asses 'cross da country".
Yet virtually every organized display of homosexual pride features kinky carnality, usually displayed by males. However the gay community feels about the stereotype (my sense is that it is pretty mixed, with lesbians much less likely to flaunt their sexuality than gay men are), it isn't surprising that gay men are more likely than just about any other group to act like sex nuts.
Both parties to the 'union' have the male sex drive to contend with. Imagine if the girls you were attracted to had the same drive as you, with a similar disinclination toward long-term commitments. That is repulsive to some guys, but to far fewer than such a situation is to most girls. Among readers, it probably would not represent much of a change in the way life is lived. But as we travel west along the bell curve, the benefits of impulse restraint becomes less and less obvious. Women generally control access, so they are crucial in limiting and restraining activity among men. Gay guys don't enjoy (suffer?) from this.
The bathhouses and the bathroom stalls have always been a gay guy thing. As cultural acceptance of homosexuality becomes more widespread, expect more of this carnality to be on public display. The stark contrast between gay men and lesbians will similarly become even more obvious (that is, the animalistic sensuality of the gay pride parades versus the soulful platonism of the Indigo Girls).