Men don't have rules or codes. Society forces men to have rules or codes. At the moment I'm unable to pass well enough to hang out as 'one of the guys' but when I DO hang out with guys who are okay with me being trans I act like every other gay man out there. I flirt if they're cute, I joke and laugh when it's appropriate (and sometimes not, if I had a drink!). I don't concern myself with rules besides the typical 'don't double dip' which even some men in their 50's (I'm thinking of a specific guy I know) STILL double dips.