The volume of semen porn milf that is ejaculated depends on several factors, including the male health, age, degree of sexual excitement, and the time since his last ejaculation. It is also followed by dedicated industry publications and trade groups as well as the mainstream press, private organizations , government agencies, and political organizations. Voyeur pornography may also include shots of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. Standing up, a chair, the corner of an item of furniture, or even a washing machine can be used to stimulate the clitoris through the labia and clothing. The fantasy is typically based around one or more larger beings dominating a smaller being. Patricia Hill Collins, an African-American writer, theorizes that this is derived from a stereotype that those of black descent are promiscuous, and their buttocks are objectified by porn as a result. Such grounds and even the definition of pornography have differed in various historical, cultural, and national contexts. Female masturbation involves the stroking or rubbing of a woman vulva, especially her clitoris, with an index or middle fingers, or both. Bukkake pornography involves a performer, usually female, onto whom several men or women ejaculate, usually on the face. As a form of non-penetrative sex, it can be done for its own enjoyment or as foreplay. Among swinging 3d hentai couples, one of the two partners is often the driving force and the other is more passive-supportive of the addition of additional sex parties. Gay pornography is the representation of sexual activity between males. Many transgender people regard the term shemale as offensive, arguing that it mocks or shows a lack of respect towards the gender identity and gender expression of transgender individuals; in this view, the term emphasizes the biological sex of a person and neglects their gender. This makes varying degrees of stimulation an integral part of oral gay twink porn sex for many men.