Well, there is a difference between fetish and perversion for example.  Fetish is a sexual attraction to something that in itself is not inherently sexual.  So for example some people find leather arousing, leather in itself is not a sexual stimulus, the same way a penis is.  I for example have a fetish for thick rimmed black glasses.  There is no sound explanation for it, by themselves they are not sexualised, but put them on a handsome young man of honestly any sort and the chances of me wanting to have sex with him have increased by 50%!

As for perversion, i believe the definition of perversion is to take pleasure in something that is inherently "wrong".  Now being gay and a part of a sub culture of sexual activity that strays from your mainstream this places us squarely on the opposite side of the white picket fense and hence "wrong", well "wrong" by a Jeudo-Christian model.  For example, Harry and Jeraldine, your 2.3 children and a dog small home owner might think things like rimming, threesomes, anal, bdsm all to be "perversions".  By our standards its quite run of the mill and not "wrong" at all.  [Mind you i'm working off sterotypes of Harry and Jeraldine, in all honest i expect that they are swingers who like to flog each other after mass on sunday as she puts rides her husband with a strap on.  ie.  It's only good cause its wrong. ;)]

So i guess when it comes to the gay community our definitions of fetish/perversion are a little more extreme than most partially because we deviate from the norm already, and therefore it might be out there but nobody might have though previously to categorize it as such.  So the question, what exotic fantasies don't you see labeled?

-Cheers
D