one's passion

eccentricity

mysophobia

pedophilia

Proclivity; natural inclination; habit

sexual fetish

bad habit

exhibitionism

transvestism

pica (medicine)

foot fetish

onychophagia (nail biting)

indecent exposure

addiction

(sexual) fetishism

foot fetish

necrophilia

sadism (fetish)

lit. cut sleeve (idiom); fig. euphemism for homosexuality, originating from History of Western Han 漢書|汉书: emperor Han Aidi (real name Liu Xin) was in bed with his lover Dong Xian, and had to attend a court audience that morning. Not wishing to awaken Dong Xian, who was sleeping with his head resting on the emperor's long robe sleeve, Aidi used a knife to cut off the lower half of his sleeve.

moral fastidiousness; psychological obsession with maintaining moral purity in thoughts, relationships etc