If they know you are worldly and gay they will expect you to behave badly, that's what worldly people do.
Give them the shock of their lives and be a nice wordly gay person, on some level it will surprise them to no end.
I remember an uber dub friend of mine that over the years had several casual worldly friends that were gay.
She never ceased to be surprised at what nice normal people they were and she would comment on it frequently.