None
I knew i was gay before i even sucked a dick or had any sexual contact with a man
There are plenty of gay men who do not like sucking dick and some haven't done that for years after trying. Sucking dick or any other sexual act is not what makes one gay.
I know a guy who doesn't like having sex but he lives with a guy and they are a gay couple and are known so;
Being gay is not just what you do but more how you feel