You've signed up for a clinical trial - totally unaware of what is in store for you. I welcome you into the office, wearing impermeable latex and explain that we're trialling a new gas.  I warn you of the risks... but you've already signed the agreement form so it's not as if there is any backing out now. I put on my gasmask, and flood the room with gas.  It'll fill you with euphoria, intense arousal, and an overwhelming desire to masturbate.  You can touch yourself, I have no problem with that... but there is one thing you need to know.  An orgasm is an absolute NO.  It has had a certain non-reversible side effect in all of our male patients.  I do hope you'll manage to resist...