(Mostly about gay porn resources, with some plain language but no actually X-rated images (though the images flirt with the rating). And there are several linguistic points.)
Yesterday I stumbled across a Gay Porn Site (as it labels itself) called “cocksuckers guide” (how crude is that?). The name cocksucker here is not used more or less literally, as ‘fellator’ (esp. a male fellator), and it certainly is not used as in this NOAD2 entry for the word:
vulgar slang, chiefly N. Amer. a contemptible person (used as a generalized term of abuse)
Instead, it’s used in a sense that’s historically intermediate between those two senses, as ‘gay man, queer’: though what gay men actually share is a sexual attraction to other men, fellating other men is the characteristic sexual act of a gay man, so it was natural to extend cocksucker to refer to gay men in general; but then distaste for gay men and their sexual activities contaminated the term cocksucker, and it became a slur, a term of abuse, at first used of gay men and then generalized, ultimately even to inanimate objects: (said of a recalcitrant corkscrew) This cocksucker [or: this cocksucking corkscrew] doesn’t work!