There is a gay in every family, afterall.

[homoperfect]

Unless he has publicly announced his gaydom and freely jokes about it, I wouldn't mention it too much. Being Gay is not the definig characture of his personality. Find general issues that you know and talk about those. but if the issue comes up don't avoid it but talk about it with ease. Also do not say that being gay is his choice. As a gay I personally find it offensive as do most gays I know. no one would choose to go threw the demeaning second class crap our society finds it nessisary to put us threw. there are just instances where no matter how attractive the opposite you just don't feel the attraction. Most gay men I know may flirt or joke about gay sex with a straight male. Some have the intent to have sexual relations while others are soley joking. either way, normally if the straight male shows irritation and are clearly uninterested, the gay guy will respect the straight male wishes. but don't say no in a joking or flirty manner, pay attention on how you deny the gay guy or the may take you as coy or not serious.