Those with diaper-related paraphilias differ widely in their focus of attention. Target audience are teenage / young adult women. Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. There are number of types of sex parties: Swinger party/gathering A swinger party or partner-swapping party is a gathering at which individuals or couples in a committed relationship can engage in sexual activities with others as a recreational or social activity. Both forms of momsex pornography generally contains nudity. Other objects such as ball hentai porn point pens and thermometers are sometimes used, although this practice can lead to injury and/or gay boy porn infection. Commenting on why there are not as many female macrophiles, psychologist Helen Friedman theorized that because women in most societies already view men as dominant and powerful, there no need for them to fantasize about it. The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. Sub-genres can also be classified into the characteristics of the performers or the type of sexual activity on which it concentrates, and not necessarily on the market to which each sub-genre appeals. Testosterone discourages fat storage in these areas. 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. Pornography may fall into more than one genre. However, bisexual pornography is often placed near the gay section in adult video stores, since many consumers are gay men. Common phrases used to refer to these individuals are chicks with dicks or the derogatory term shemale, although these are generally considered pejorative among transwomen. Sigmund Freud considered foot binding as a form of fetishism. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography.