Hidden Camera pornography involves shots that appear to spy or peep on a woman who is unaware she is being viewed or filmed while dressing, going to the bathroom, or showering; either at home or in a commercial place, such as a locker room, public restroom, spa , or dressing room. Discipline often incorporates sadomasochistic aspects, though some sadomasochists distance themselves from D/s practices such as punishment. These disappeared with a crackdown on pornography in the late 1950s. Sometimes, asymmetric and often intentionally uncomfortable positions are employed to heighten the psychological impact of the bondage. Fisting may be performed with or without a partner. Instead, lesbian relationships have often been regarded as harmless and incomparable to heterosexual ones unless the participants attempted to assert privileges traditionally enjoyed by men. A variant of this is known as ATOM or ATOGM where the insertive partner removes his penis from one recipient anus and inserts it into a second recipient mouth. Other forms of anal sex include fingering, the use of sex toys for anal penetration, oral sex performed on the anus , and pegging. In gay pornographic movies, actors who identify themselves as heterosexual, but who nevertheless perform explicit sexual acts with other males on film do not face the same stigmas as the mainstream acting counterparts and indeed can rise quickly to being featured actors. Explicit sexual activity, such as sexual penetration, may occur within a session, but is not essential. Fistees who are more experienced may take two fists . Technically mature milfs this is a form of exhibitionism rather than group sex per se. Not all crush fetishists are that extreme! It generally contains nudity or partial nudity in sexually suggestive situations. Smoking fetish involves performers smoking cigarettes, cigars, joints, and/or blunts. Pornography can be classified according to the physical characteristics of the participants, fetish, sexual orientation, etc., as well as the types of sexual activity featured.