Some fetishes I can understand, but there's a whole hell of a lot of them that know some of the psychology why, but not the why why. Then there's the ones like this. HOW THE HELL IS FARTING SEXY???
Actually... that's the third definition. [Fr fétiche, a charm, sorcery] 1) any object believed by primitive peoples to have magic power 2) anything held in unreasoning devotion 3) in psychiatry; any non-sexual object, such as a foot or a glove, that excites erotic feelings
but the third definition comes from the first; in the same way primitive people attribute magical powers to mundane items, fetishist sexualize things that are not inherently "sexy"
[Fr fétiche, a charm, sorcery]
1) any object believed by primitive peoples to have magic power
2) anything held in unreasoning devotion
3) in psychiatry; any non-sexual object, such as a foot or a glove, that excites erotic feelings
Webster's New World Dictionary