So much of hypnosis goes beyond the actual trancing and has to do with the psychology of getting the guy to do what you want without it going against his preset limitations. Much as when I interview a potential subject for sleep, it's a matter of getting them to agree, based on what will in each unique case get them to find what you want to do acceptable.
In the case of hypnosis, for instance, telling a homophobic straight guy to just strip, might have him refuse even when he is under, but if you start by setting the stage with you are very tired, all alone, your airconditioner just broke down and it is so hot. It's OK to loosen your collar, or just go ahead and take off your shirt, you can't believe how you are sweating, why don't you go ahead and get a nice cool shower. That's right, get undressed for the shower, and before you know it you have a handsome hunk in front of you with your friends all watching!
From there you could go to, your girlfriend just came in and is asking to get in the shower with you...she has such a hot body, and more than likely you will be starting to see some wood.
It's all in how you make something that someone does not and would not agree to do acceptable!