Quote from Niles in The Show Where Sam Shows Up
Niles: Is it my imagination, or is Sam flirting with Daphne? Frasier: Of course he's flirting with her. He flirts with everyone. He can't help it, he's a sexual compulsive. But he's getting help for it in a support group. [Daphne lets out an excited giggle] Niles: Did he miss a meeting?!