The volume of semen that is ejaculated depends on several factors, including the male health, age, degree of sexual excitement, and the time since his last ejaculation. Contrary to the other two types, B/D does not define the Tops and Bottoms itself, and is used gay cock to describe the general activities with either partner being the receiver and the giver. Concerted deployed sexual rejection exercised on the partner can be an aspect of Dominance and Submission as well. If one person is penetrated by two objects, it is generically called double penetration . Detective magazines, comic books and early fetish magazines In the early 20th century, Detective magazines covertly provided a way of publishing bondage imagery. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. Lolita pornography features women who are 18 years old or slightly older, who pretend to be underage teen girls. Felching is a sexual practice involving the act of orally sucking semen out of the vagina or anus of one partner. Perhaps following the example set by gay pornography, they have become a popular subgenre within heterosexual pornography since the turn of the century, featuring both vaginal and anal ejaculations. In contrast, a celebrity may take the route of openly releasing the tape and benefit directly momporn from royalties as well as indirectly from the publicity. Lying face down on a comfortable surface such as a mattress or pillow, the penis can be rubbed against it. Pornographic films are typically categorized as either softcore or hardcore pornography. Women oriented pornography is sometimes referred to 3d hentai as sex positive pornography. Snowballing or snowdropping is the human sexual practice in which one person takes someone else semen into his or her mouth and then passes it to the mouth of the other, usually through kissing. The first explicit pegging scene is believed to have been in the 1975 pornographic film The Opening of Misty Beethoven. Macrophilia is a fascination with or a sexual fantasy involving giants, more commonly expressed as giantesses .