1 eccentricity

2 peculiarity

3 strange hobby

1 mysophobia

2 obsession with cleanliness

3 extreme fastidiousness

1 pedophilia

2 pedophile

1 one's passion

2 one's obsession

1 necrophilia

1 to have strange and dangerous addictions (idiom)

1 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.