I don't know if this can properly be called a kink, but drug use is so rampant in the gay community that I felt I had to mention it.

Alcohol is certainly the most prevalent, some studies estimate that gay men are five times more likely to be alcoholics than their straight counterparts. I've seen plenty of good people ruin their lives through over-indulgence. Used in moderation, alcohol lowers inhibitions. However, it also impairs judgment and reduces motor response. "Wine increaseth desire, while it decreaseth ability" or something like that.

Bars are one of the major centers of the gay community, serving much the same function as pubs do in Irish or British culture. They aren't just drinking spots, but also social centers. This is becoming less true as the community develops and being gay becomes less stigmatized, but for many years a gay bar might be (and still is, in many places) the only safe space for a person to be gay.

Alcohol isn't the only drug in circulation. Cocaine, speed, XTC, crack, K, acid and heroin are just a few of the things you can get. I have nothing against recreational drug use in moderation, but for so many people moderation isn't possible.

One drug that is sort of borderline legal is amyl nitrate, also known as "poppers". Medically, this aromatic inhalant increases the heart-rate and blood-pressure briefly, inducing a head rush and feelings of euphoria. As a side-effect it also dramatically increases sexual desire and pleasure. It comes as a liquid, usually in a small brown bottle, and you inhale the vapors. Back in the '70's guys would soak bandannas in it to take out while dancing.