You have volunteered to assist me in my laboratory with a very special research study without knowing all of the details. Allow me to fill you in: I am conducting an experiment about stimulation of the penis, then how pain and discomfort influence the state of arousal. The only things you need to complete this task are your penis and a package or rubber bands. Let's get you stimulated a bit, stroke your penis, and then I will show you what I want you to do by demonstrating on a realistic dildo. I want you to follow along EXACTLY as I do. Answer my questions, and let's see how much pain, pinching and snapping elastics against your sensitive skin you can handle. In this CBT experiment, your reactions and body language will tell me everything I need to know.