well, i think the gay male stuff is more popular
with females, in the same sense, lesbians
interest guys.  

Also, i think it just has to do with your sexual
preference.  If you dig guys, two guys gives you
double the fun, right?   (lol, sounds like a 
doublemint gum commercial?)  Or if you like
females, seeing two females getting it on,
tends to cause interest.

Whatever floats your boat, whether female,
male, or other.  Just keep it legal, ok.