I am not 100% sure. The IMDB so far only cites the stripper, Diablo Cody, as a writer.
For me it's not unbelievable that a "sex worker" wrote this shit. I think she is totally okay with normalizing "sex positive talk"
Diablo Cody, Writer: Juno. Diablo Cody is originally from Chicago, Illinois, and moved to Minnesota to live with her Internet boyfriend, Jonny who later became her husband. While there, she decided on a whim to take up stripping as a hobby of sorts. She was working at an ad agency and got a...
www.imdb.com
I heard that the writer's guild have more power in Hollywood than it seems. Once a writer is in a contract, it's super difficult to simply fire them. And even if they do not have a contract that protects them, it super easy to go on twitter and say "I was fired because of the misogyny/racism on this company."