You're The Worst: Jimmy's Rom-EROT Author Sign In Sheet
Jimmy attends an erotica expo to push his book. He later goes to an after-party and hooks up with Adrienne (Amy Pietz), a fellow author, though their coitus is interrupted when she has to throw up. Jimmy gets a surprise call from Gretchen who, despite just committing to Boone, asks how he is doing at the expo and then wants to dish about Lindsay's party.
Season 4 Episode 8 " A Bunch Of Hornballs".