I think holly that the first question would be Is getting fucked in the ass by a chick with a strap on considered gay.
You could theorize that defining gay is an attraction thing and has nothing to do with sexuality. If you find same sex people attractive and seek them out for emotional comfort, then you are gay. However that would define a much greater portion of society gay at the release from gaydom of people who don't find same sex attraction but do like things in their ass.
Personally I don't like anal. It hurts when I take a large dump. The last thing I want is something being pummeled in my ass. I'm also not interested in it with females, UNLESS they say no. Then it's the forbidden fruit and all I can think about it tapping that ass. But if it's openly available then I'm really not interested unless her vagina is stretched so much my little white dick keeps falling out. Then I may hit the ass just so I can feel something.