Now that the title has got you reading, I want to talk about a facet of hypnosis that is often under-discussed.
There is a very slim portion of people who view hypnosis as a sexual fetish. Often under the faulty premise of hypnosis as mind-control (which I emphatically say here that it is not), hypnosis is used by fetishists as a mental parallel to physical BDSM. In much the same way bondage is physical control, recreational hypnosis can be used as a form of play mind control.