FETISH

(INTEREST) [noun] [C] - a sexual interest in an object or a part of the body other than the sexual organs, or an activity or object which someone is interested in to an extreme degree and to which they give an unreasonable amount of time or thoughta rubber/foot fetishHe has a fetish about/for high-heels so sometimes as a treat I wear them in bed.She has a well-publicized shoe fetish (= interest in shoes) and is reported to own over five hundred pairs.She makes a fetish of (= gives an unreasonably large amount of attention to) organization - it's quite obsessive.