The act may be carried out face to face, or head to tail, with the woman recommended to be on top if she has smaller breasts. Solo pornography recognized with AVN Awards include the All Alone series and All Natural: Glamour Solos. Though there have been numerous gang bang pornographic films since the 1980s, they usually involved no more than half a dozen to a dozen men. In some scenes or relationships it may be impossible for consent to be withdrawn in the middle of a scene, or the bottom may have the ability to revoke consent for a relationship as a whole, gay fuck but not for a particular scene. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent pregnancy. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. The term is typically used by the cinematographer within the narrative framework of a pornographic film, and since the 1970s has become a leitmotif of the hardcore genre. Tentacle erotica can be consensual, but frequently contains elements of non-consensual nude milfs sex. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. Two women tapegagged and cuffed to iron bars Bondage and Discipline are two aspects of BDSM that do not seem to relate to each other because of the type of activities involved, but they have conceptual similarities, and that is why they appear jointly. Voyeur pornography may also include shots gay hentai of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. Among swinging 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. Hamedori is a genre of Japanese pornography in which a male adult video actor or director serves as the camera operator.