See Gay-for-pay. Along with the penis, the scrotum is sensitive and hentai videos considered to be an erogenous zone. The interaction between tops and bottoms—where physical or mental control of the bottom is surrendered to the top—is sometimes known as power exchange, whether in the context of an encounter or a relationship. Bareback sex is physical sexual activity, especially sexual big tit milf penetration, without the use of a condom. In many cases, that person is also aroused by smelling body parts that have a urine scent. Arousal may be triggered by seeing the body movements or facial expressions of that person. The fundamental principles for the exercise of BDSM require that it should be performed with the informed consent of all involved parties. As in B/D, the declaration of the Top/Bottom may be required, though sadomasochists may also play without any Power Exchange at all, with both partners equally in control of the play. Well-known female porn stars who expressed their pleasure in pegging their male partners include Taylor Wane, Debi Diamond, Brittany Andrews, and Monique Covét. Guro or Gore is a genre of Japanese pornography gay twinks involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. Other forms of anal sex include fingering, the use of sex toys for anal penetration, oral sex performed on the anus , and pegging. The stimulation may involve hands, fingers, everyday objects, sex toys or combinations of these. In the 1970s, the hardcore pornography genre introduced the stereotypical cumshot scene as a central element of the hardcore film, in which the male actor ejaculates in a way ensuring maximum visibility of the act itself. When questioned about her particular kink Covét replied, If we women have to take it from behind, then why not a man? Bukkake videos are a relatively prevalent niche in contemporary pornographic films. The higher pay scale and profile within a production often leads to group scenes where a straight actor only tops. The Japanese sex industry uses the term Paizuri .