Quote from Niles in First, Do No Harm
Frasier: Marie is not using me. She would want me just as much even if I weren't a psychiatrist. You know, you're jealous. You're jealous that I'm having sex. Jealous that I'm having hot, passionate, sweaty jungle sex. What are you having? Niles: [to the waitress stood behind Frasier] I'm having a latte.