I think that's an interesting perspective. Though I think it would be weird for my dentist to ask me totally personal questions about my love life and to suggest seeing me every week. I don't really see the boundary situations as terribly similar, as my relationship with my therapist isn't based on any kind of medical model (and I would run from any therapist who looked to doctors or dentists for ideas about how to treat other human beings) but then boundaries aren't a big problem or issue in my therapy.

I do think it's probably sensible most of the time to err (or air!) on the side of conservative boundary-wise, particularly if the therapist is new and finding his or her feet.