Unless something happened to me that prevented me from feeling pleasures from sex and eating as I do now, I would have no interest whatsoever in trying this. But for someone who can't and wants to, I can see it might serve a useful purpose.
It seems that it could develop to the point of being able to trigger pleasures from many other things. So, for example, if your sense of smell is not functioning properly, you aren't able to fully enjoy eating or smelling a beautiful flower or another person. Turning on those pleasures could also be beneficial.
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