My wife and I both went together for several sessions many years ago as we were having some marital problems and the diaper wearing/using was part of it. The Dr. explained that as long as what I was doing was not harming others, including my wife, what was the problem with it. She also mentioned that this fetish is not that uncommon. My wife has since decided that I can pretty much wear whenever I want, being discrete in public, but she does not want to partake in any of it.