The Adventures of Rick Quick, Private Dick (1986)

Screenwriter Gary Kendall has been hired to write a script for a demanding porn producer named Regina Vagina. He gets a severe case of writer's block until he comes up with the idea of a porn detective named "Rick Quick". The ideas come to him fast and furious, but his character's sexcapades keep getting interrupted by his own sexcapades--with everyone from his sexy new neighbor to the girl at his phone-answering service.