The naked celebrities reverse of this, in which nude women interact with clothed men, is called Clothed male, naked female . Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. A pornographic work is characterized as hardcore if it has any hardcore content, no matter how small. Men may also rub or massage the glans, the rim of the glans, and the frenular delta. Bukkake is a sex act portrayed in pornographic films, in which several men ejaculate on a woman, or another man. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. In the fetish cuckolding subculture, it is most common for the female to take on the sexually dominant role and the male the submissive role, however, female subs, sometimes referred to as cuckqueans, also exist. Both forms of pornography generally contains nudity. Irrespective of the legal or social view of pornography, it has been used in a number hentai videos of animated porn contexts. Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, or drawings. Sub-genres can also gay twinks be classified into the characteristics of the performers or the type of sexual activity on which it concentrates, and not adult anime necessarily on the market to which each sub-genre appeals. Sexual orientation Pornography features an increasing variety of combinations of actors by their sexual orientation such as lesbian, gay, bisexual, and transsexuals in addition to traditional heterosexual roles. The industry generally refers to such films as adult films, which is part of adult entertainment. 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 . A related term used in milf xxx the genre is the term cougar, which implies an older woman as predator. Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other young gay porn objects.