Penis humiliation or small penis humiliation (SPH) is a fetish where penis owners get turned on when their partners belittle the size of their penis. This is regardless of the person's actual penis size. They can have an adequately sized penis and still crave penis humiliation. In fact, a good number of kinksters who love SPH have average to large-sized penises.
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While much less common, big penis humiliation is also a fetish for some penis owners.