I had an erotic massage last year in Las Vegas and when the therapist walked into my hotel room, he immediately asked to see my dick. I was wearing only shorts and a t-shirt. I was startled by the request, but complied. He said OK. then he set up his table. We both got naked and proceeded. Good massage with HE.
I asked him later why he wanted to see my junk, naively assuming that if he didn't like what he saw, he would leave. He told me it was to prove I wasn't a cop, because "cops aren't allowed to do that." Is that correct.