Season 9: Episode 213: The One with the Fertility Test
Ross struggles with the conflict between his own interest in Charlie and Joey's desire to impress her. He coaches Joey on doing and saying things that she'll appreciate. Rachel has a gift certificate for a free massage at a big corporate massage chain; Phoebe makes her promise not to go. She goes anyway, and discovers that Phoebe works there. Monica and Chandler go in for fertility testing and bump into Janice. Later, the doctor calls and tells Chandler that he and Monica both have fertility problems.