Pornography gay male sex can be classified according to the physical characteristics of the participants, fetish, sexual orientation, etc., as well as the types of sexual activity featured. The fetish centers around this fantasy portrayal. Transsexual pornography features transwomen performers, who typically have male genitalia and augmented female breasts . Often a dominant woman, she may be called a Dom, Domme /ˈdɒm/, Femdomme, Domina, or Dominatrix, depending on context or personal preference. The Japanese sex industry uses the term Paizuri hentai sex . The exact source and nature of the fluid continue to be a topic of debate among medical professionals, which is also related to doubts over the existence of the G-Spot. Along with the penis, the scrotum is sensitive and considered to be an erogenous zone. Targets the male audience, but is much less popular than Yaoi. Bestiality pornography involves the sexual attraction of humans to animals. Pegging is a recently invented word which features a woman penetrating a man with a strap-on dildo. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections . In these cases, the appearance of an enlarged abdomen caused by obesity or overeating may be sufficient, or simply the suggestion of a protruding navel. Pornographic films are naked celebrities generally classified into sub-genres which describe the sexual fantasy which the film and actors attempt to create. As of 2010, they were reported to live together as a monogamous couple outside of their porn careers and want to continue working together for another 50 years. Fisting may be performed with or without a partner. Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake. Discipline often incorporates porn milf sadomasochistic aspects, though some sadomasochists distance themselves from D/s practices videos porno gay such as punishment.