There has been a tremendous hype about feminization hypnosis. This is the idea that a man can hypnotize himself, and Wow! he becomes a woman. Before looking at this idea, it may be worth having a look at what feminization is in the first place.
Feminization is the process of converting a male into a female. This is not as bizarre as it may sound at first. Some animals do this in nature. For example, certain male lizards can become females if there are only males around. Certain species of snails can convert between male, female and hermaphrodite according to the needs at the time.