The purpose of this thesis is to study the aspects of sex identity in the contemporary men`s fashion expressed through sexual image and taste in the latter half of twentieth century. The aspects of sex identity expression in the contemporary men`s fashion can be classified by image, that is, homosexual, heroic, bisexual, and fetish. 1. The homosexual image has shown the tendency to emphasize the masculinity since 1950·60`s. It can be found in `Cowboys costume` which is typical of American traditional fashion, and jeans and underwear fashion expressed by muscular men has homosexual characteristics which contain narcissism. 2. Based on men`s traditional gender role, the heroic image emphasizes men`s physical characteristics and expresses tough and offensive masculine beauty in men`s suit which is free from the authority and formality. 3. The bisexual image denied the division of gender role by costume and destroyed the traditional sex model by resolutely applying women`s costume such as skirts to men`s fashion. 4. The fetish image is similar to bisexual image in that they wear women s costume, but different in that it expresses sexual desire or fantasy. It is expressed through brilliant color, leather and metal ornaments, and sensual element of women which emphasizes "body". This shows the sex identity of contemporary men who want more sensible and free life.