Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. There is some crossover between the wet and messy fetish and clothing destruction fetishes. For several years he published a number of small illustrated bondage/fetish photo-booklets. Boot fetishism is a sexual fetish focused on boots. PVC clothing is common in Goth, Punk, clothing fetish and alternative fashions. Swimwear fetishism is a sexual fetish relating to swimwear. Anesthesia fetishism is a sexual fetish for anesthesia. Foot fetishism is the most common form of sexual fetish. Another popular clothing fetish involves cheerleader uniforms. Exhibition of stereotyped material in mainstream media has promoted the idea of the "Asian fetish". A transvestic fetishist is a person who cross-dresses as part of a sexual fetish. Body worship is a common theme in the work of Japanese fetish artist Namio Harukawa. A sexual fetish involving head shaving is called trichophilia. Tickle torture has become the subject of many fetish/sexual publications. Some consider it a simple sexual fetish and an outlet for sadomasochistic desires.