it is a paraphilic disorder. a paraphilia is basically a fetish; a paraphilic disorder is a paraphilia that, if satisfied, is harmful to society or self.

i’ve also seen some people describe it as a sexual orientation. i disagree with that, but at the same time homosexuality was considered a paraphilia a while ago, and the difference between sexuality and kink isn’t quite so well defined or researched, so i see where they’re coming from.