Phoebe Waller-Bridge, creator and star of Fleabag, recently talked with Late Night host Seth Meyers about bringing her acclaimed monologue show to New York, and her good friend and Oscar winner Olivia Colman, and more.

Waller-Bridge explained that the voices heard in the Off-Broadway production, currently running at the SoHo Playhouse through April 14, are the originals from the London staging. The performer shared that audiences will hear her director’s ex-boyfriend and her own mother, and goes on to describe just how exactly the many sex sounds were created for the one-woman show.

Being on a tight budget, most of the sounds heard needed to be made by the creator herself and whomever else was around to help out. “I ended up in a cupboard, with my sister, with my director [Vicky Jones] lightly tapping my bum,” she explained for one particularly tricky sound.

Additionally, Waller-Bridge, who has been touring the talk show circuit, goes on to talk casting real guinea pigs for the TV adaptation of the play, which involved selecting the furry creatures based on their celebrity look-a-likes like Jennifer Lawrence and Emma Stone. In a second clip, below, the Fleabag creator describes her friendship with recent Oscar winner Olivia Colman and how she got a particularly nasty performance from the popular Brit.

Both Fleabag and BBC America's Killing Eve, developed and executive produced by Waller-Bridger, return for second seasons this spring (the former premiered March 4).