Such grounds and even the definition of pornography have differed in various historical, cultural, and national contexts. The most common male masturbation technique is simply to hold the penis with a loose fist and then to move the hand up and down the shaft. 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. The slave is usually strictly forbidden from placing their lips directly on the body of the dominant so the practice routinely involves them receiving much of the spray all over their face, hair and body, however, another way of doing this that applies mostly to male dominants, is to place the mouth on the head of the penis and drink the urine as it is released. Voyeurism is the sexual interest in or practice of spying on people engaged in intimate behaviors, such as undressing, sexual activity, or other actions usually considered to be of a private nature. Mutual masturbation foreplay The manual stimulation of each other genitals where the session eventually leads to sexual intercourse. Coprophilia , also called scatophilia or scat , is the paraphilia involving sexual arousal and pleasure from feces. The precise definition of roles and self-identification is a common subject of debate, reflection, and discussion mature milfs within the community. These include gently sucking anime hentai and tugging on the scrotum and use of lips to ensure minimal contact with their teeth. Milking pornography features lactating women being milked or milking themselves . As well as traditional attraction, the topic gay sex video also incorporates feederism and gaining, where sexual gratification is obtained via the process of gaining body fat. Particularly, some pornography in this genre features butch women, who are almost never seen in mainstream pornography. Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme, for example, a male performer dressed as a wizard.