Two women tapegagged and cuffed to iron bars Bondage and Discipline are two aspects of BDSM that do not seem to relate to each other because of the type of activities involved, but they have conceptual similarities, and that is why they appear jointly. Some anthropologists and sociobiologists believe that breast fetishism derives from the breasts similarity to buttocks, but instead provide sexual attraction from the front of the body. Specific sex acts Anal Anal pornography features anal penetration with a penis, dildo, other objects, or some combination of them. Target audience are teenage / young adult women. Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs. Cuckold fetish pornography that involves a cuckolded husband. Bondage/BDSM Bondage pornography features performers tied up or constrained in various ways. It is also known colloquially as gushing or squirting, anime hentai although these are considered to be different phenomena in some research publications. For instance, Amateur Allure has a trademark shot where the sexually performing cameraman circles a handycam around the sexually gay bear porn performing model head. If one person is penetrated by two objects, it is generically naked milf called double penetration . Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . Reality pornography is professionally made porn which seeks to emulate the style of amateur pornography. In the gay pornography industry, which uses amateurs as well as professional actors, the term gay-for-pay refers to actors labeled or believed to be straight but who engage in same-sex sexual activities for money. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection.