ADAM & STEVE — * 1/2 — Craig Chester, Malcolm Gets, Parker Posey; not rated, probable R (vulgarity, drugs, profanity, sex, brief nudity, violence).

"Adam & Steve" does distinguish itself from its fellow gay comedies — in exactly one way: It's possibly the most low-brow of the lot.

To give you an idea of the level of humor here, the film opens with a gag about recreational drugs laced with laxatives. And things don't improve from there.

If not for Parker Posey, the movie would be intolerable. That it is almost watchable is largely due to Posey's loopy presence.

The title characters are two would-be lovers, Adam (Craig Chester, who also wrote and directed) and Steve (Malcolm Gets). They meet in a dance club during the '80s, though their planned one-night stand ends in disaster. They don't meet again for more than 15 years, and when they do, they don't recognize each other (Adam used to be a goth; Steve was a glam-rocker).

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Conveniently, Steve's friend, a once-obese stand-up comedian named Rhonda (Posey), and Steve's pal Michael (Chris Kattan), Adam's neurotic, straight roommate, have begun dating as well.

First-time filmmaker Chester's plotting follows the cliched, will-they-or-won't-they path, and none of the contrived romantic roadblocks he's created seem very believable. Worse, he and Gets really don't have much chemistry.

That leaves it up to Posey, and she does get the only funny lines of dialogue in the film, but there aren't nearly enough of them. And as her romantic interest, former "Saturday Night Live" comic Kattan isn't nearly as irksome here as he usually is.

"Adam & Steve" is not rated but would probably get an R for crude sexual references and humor, as well as bodily function humor, some strong drug content (including cocaine use), occasional use of strong sexual profanity, simulated gay sex and other sexual contact, brief male nudity and some comic violence (a brief scuffle). Running time: 99 minutes.