When in work mode, nurses don't think anything of the sight of a man's genitals, so we set up some naughty traps and make them "show us their erections from their flaccid penises" to bring them back to a state closer to their private lives. The nurses politely decline, but gradually become excited and show their true faces. The touching of the penis, which started out as "for the patient," eventually awakens their arousal.