“How low can you go?” is an apt motto for the intentionally gross, often funny all-star sketch comedy “Movie 43.”

Grade: C

Shot in segments by a variety of directors including Peter Farrelly and Brett Ratner during the past four years with a mind-boggling starry lineup (Hugh Jackman, Kate Winslet, Naomi Watts, Halle Berry, Richard Gere, Uma Thurman, Emma Stone), “Movie 43” (the title has no meaning) is held together as a last ditch pitch for a movie to studio exec Greg Kinnear by a desperate Dennis Quaid.

As Quaid’s ideas come to screen life, Kinnear is appalled — and then Quaid pulls a gun and tells more stories.

The first sketch has a horrified Winslet on a blind date with cheery Jackman who doffs his scarf to reveal a pair of testicles hanging prominently from his throat.

It only gets worse, so to speak, as (real life) couple Watts and Liev Schreiber are dementedly sadistic parents who home-school their son to ensure that this “should be the unhappiest time of his life.”

Lovely Anna Faris appears to propose that her beau poop on her. In this context, Kieran Culkin and Emma Stone’s lusty talk over a supermarket’s sound system is almost innocent.

Sex in advertising is satirized with a buck-naked “iBabe” MP3 player that mangles fingers or other appendages.

Perhaps because it’s neither gross nor sexually frank, a fake superheroes speed-dating episode with Justin Long’s fake Robin and Jason Sudeikis’ chubby fake Batman is just pointless.

Johnny Knoxville and Seann William Scott torture a pair of tough leprechauns (both a miniaturized Gerard Butler).

A post-credits sequence parodies “Ted” as Elizabeth Banks competes with an animated gay cat for Josh Duhamel’s affection.

“Movie 43” Rated R. At the AMC Loews Boston Common, Regal Fenway Stadium and suburban theaters.

(“Movie 43” revels in adult language, endless sexual references and bad taste.)