Why do people have fetishes, such as foot fetishes?
How do such fetishes form?
Are childhood incidents the main cause of fetishes?
Are fetishes a sexual disorder?
Having one or more fetishes is very widespread, and thus rather normal.
The prevalence of fetishism is not known with certainty.[21] The majority of fetishists are male.[21] In a 2011 study, 30% of men reported fetishistic fantasies, and 24.5% had engaged in fetishistic acts. Of those reporting fantasies, 45% said the fetish was intensely sexually arousing.[23] In a 2014 study, 26.3% of women and 27.8% of men acknowledged any fantasies about "having sex with a fetish or non-sexual object". https://en.wikipedia.org/wiki/Sexual_fetishism
A disorder is per definiton something abnormal
disorder [dis-or“der] a derangement or abnormality of function; http://medical-dictionary.thefreedictionary.com/disorder
So the answer to your question would per definition be: No. Having fetishes is normal and not a disorder.
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$\begingroup$ But abnormality is not enough, right? Or we can assume people with very high IQ to have a disorder (well, they can have, and these parameters can even be correlated; yet, having high IQ alone is not a disorder). $\endgroup$ – rus9384 Jul 13 '18 at 0:53