You could try to bring it up subtly. "You look like you could be a great massage therapist". Then jokingly refer to the rub and tug parlors. And see the reaction from there
I wouldn't introduce someone I know to hobbying, because I don't want to feel any remorse/envy over the outcome of that persons life(whether good or bad).
For a guy it would be hobbying, for a woman it would be introducing her to sex work (assuming you're going to pay her). So if a guy maybe take him to an sc then to a nearby mp.
I gave a friend of mine an mp gift certificate, don't know if he went.