disposition; inclination; propensity
Refers to a person's natural tendency, habit, or characteristic way of thinking/behaving, often with a slightly negative or peculiar connotation.
He has a propensity for lying.
Her meticulous disposition serves her well at work.
sexual disposition; fetish
Colloquial use referring specifically to sexual preferences or kinks.
He has unusual sexual tastes.
He has a tendency to collect things.
She kept her fetish hidden from everyone.
He confessed his fetish online.