Co-written by lead actress Lauren Anne Miller, For A Good Time, Call... is a potty-mouthed comedy about flatmates who discover their calling as phone sex operators.

The sassy sisters earn upwards of $800 a night by catering to the X-rated fantasies of male clientele while ironing smalls or washing dishes. In these cash-strapped times, Jamie Travis’s empowerment fable proffers an attractive business model and the characters certainly enjoy the spoils of their salacious banter.

There’s a very sweet short, endearing bra-mance here.

Unfortunately, Miller and Katie Anne Nelson’s script is twice as long as it needs to be. They slather on the cloying sentimentality and stumble with a running gag about one girl’s parents showing up.

The girls’ saucy venture flourishes, sowing the seeds of friendship between the flatmates. While Lauren plucks up the courage to man the hotline – “I don’t want to be boring any more!” – Katie falls for customer Sean (Mark Webber).

For A Good Time, Call... is galvanised by the appealing double-act of Miller and Graynor, who clearly have a hoot with their foul-mouthed shrieks down the receiver.

Their characters are poorly developed, though, and the speed bumps in their relationship are clearly sign-posted.

Long camps it up a treat in an eye-catching supporting role as the BFF and there are amusing cameos including Seth Rogen as pilot, who berates a colleague for interrupting him – “I’m busy. Delay the flight!” – and Nia Vardalos as a steely publisher, who suggests Lauren’s foray into adult entertainment is a phase like her own dabble with same-sex relationships.

“I’m a hasbian,” she deadpans. There’s a Frankenword for everything nowadays and the word for Travis’s film is passable.

TWO STARS