When people commonly speak of fetishes, they're referring to what's known in psychiatry as "fetishism." One example is the underwear fetish. At what point is this considered an illness?!
He has a disorder known in 
psychiatry as "fetishism."
Er leidet an einer Störung,
die wir Psychologen „Fetischismus“ nennen.
En psychiatrie,
Ha un disordine conosciuto in psichiatria
 come "feticismo".
Ele tem uma desordem mental chamada "fetichismo."