Only after we were no longer doing therapy. I've gone out for lunch with former therapists AFTER we had finished (several years later) when one of us happened to be in town.

The only exception to that was with my second therapist who happened to also be one of the pastors of my church. We worked together on several church projects not related to therapy. I knew him before I started therapy with him though and had worked on projects for church previously with him, so it really didn't have any weirdness to me -- just more of the same. I never felt like those activities spilled over into my therapy (or vice versa). They were things like summer vacation Bible school, musical service coordination, Habitat for Humanity, etc., and I was one of many volunteers he worked with. I didn't feel like it was special treatment or that he was getting anything out of it.