Jason Sudeikis, Alison Brie Are "Not a Couple But Act Like One" in 'Sleeping With Other People' Trailer

Leslye Headland's 'Bachelorette' follow-up will hit theaters on Sept. 11 after debuting at Sundance.

The first trailer for Bachelorette writer-director Leslye Headland's Jason Sudeikis and Alison Brie romantic comedy Sleeping With Other People has debuted online.

The preview introduces Jake (Sudeikis) as a womanizer and Lainey (Brie) as a cheater. The duo, who lost their virginity to each other, reconnect 12 years after college and begin a platonic friendship that ultimately gets couple-level close.

But they establish a safe word for when the sexual tension gets to be too much. While the trailer doesn't reveal what that word is, it is clear that it's not "avocado," deemed "too sexual" by Jake.

The rest of the trailer shows Jake and Lainey visiting their regular restaurant, shopping together and, in one of the film's memorable scenes, taking MDMA before going to their friends' kid's birthday party, where Lainey teaches the kids to dance.

Headland wrote and directed Sleeping With Other People, which debuted at Sundance where it was bought by IFC Films. The movie has since gone on to play at a number of other film festivals, including Tribeca and this weekend's Nantucket Film Festival, where Headland is also being honored.

The movie co-stars Amanda Peet, Natasha Lyonne, Jason Mantzoukas and a virtually unrecognizable Adam Scott. The film, which was originally set to hit theaters on Aug. 21, will now open on Sept. 11.

Headland has frequently referred to the film as "When Harry Met Sally for assholes," and much like the Meg Ryan-Billy Crystal classic, Sleeping With Other People is a true romantic-comedy, with some risque moments Bachelorette fans would expect.

Sidney Kimmel fully financed the film and produced along with Adam McKay, Will Ferrell and Jessica Elbaum of Gloria Sanchez Productions, which produced Bachelorette. Carla Hacken, Matt Berenson and Jim Tauber served as executive producers.