Preferring a guy's ass to be small and narrow

I am gay and I get turned on by guys who have narrow and tiny ass. Big ass just isn't manly. Now if the guy has that kind of ass and has a cute face and wide chest, then that's a super turn-on.
Is this similar to how straight males prefer females to have a big ass? I never understood this. Perhaps straight guys wouldn't understand me either on why I get turned on by guys with small ass.
Is this normal for gay guys like me?