These terms are used by the public interchangeably, which can lead to confusion. Ethnic pornography is a genre of pornography that features performers of specific ethnic groups, or depictions celebrity porn stars of interracial sexual activity. Interracial pornography typically employs ethnic and racial stereotypes in its depiction of performers and many of interracial pornographic films still include racial stereotypes, although the segregation of actors by race has diminished considerably. Smoking fetish involves performers smoking cigarettes, cigars, joints, and/or blunts. Sometimes, asymmetric and often intentionally uncomfortable positions are employed to heighten the psychological impact of the bondage. Voyeur or peeping Tom pornography is usually more staged with the subjects aware of the cameras, sometimes openly including this exhibitionist awareness. The position allows the pelvic floor muscles to relax and therefore partly exposing the labia minora to intimate touch. Moreover, many gay or bisexual men who star in gay porn films may wish to be identified publicly as heterosexual for personal or professional reasons. Pornography is the portrayal of sexual subject matter for the purpose of sexual arousal. There are no particular or preferred elements within maiesiophilia that are common to all maiesiophiliacs. Bondage is usually, but not always, a sexual practice. They are most often featured with male partners, but are also featured with other transsexuals or cissexual women. Yiff or Yiffy pornography features Furry or anthropomorphic animals in an erotic or sexual context. While most tentacle erotica is animated, there are also a few live-action movies. The Japanese sex industry uses the term Paizuri . As observation is encouraged, voyeurism and exhibitionism are closely associated with dogging. Buck Angel is the best-known actor in this genre. In a bath or shower a female may direct tap water at her clitoris and vulva. With second wave feminism and growth of scholarship in women history and sexuality in the 20th century, the definition of lesbian broadened, sparking a debate about sexual desire as the major component to define what a lesbian is.