Why the need to categorize gay people?

I'm male, married to a woman, fantasize sucking real dicks, I suck my wifes squrtable strap on at her pleasure, but I am not gay. The thought of kissing another man repulses me. But after so many years of getting head and watching the fun they are having and the moaning and the payment of the flavorful liquid prize in the end; why is it that they have all the fun?