Common phrases used to refer to these individuals are chicks with dicks, trannies, or shemales, hot gay sex although these are generally considered pejorative slurs among transwomen. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual big tit milf kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being. Men and women may 3d hentai masturbate until they are close to orgasm, stop for a while to reduce excitement, and then resume masturbating. In addition to mainstream pornography, the popularity of facials has led to creation of its own niche market, like video series that specialize in showing the act. Male masturbation may differ between males who have been circumcised and those who have not. The person sat upon may be in bondage, sexually submissive, or simply held down by the body-weight of the other person. The buttocks in human females thus contain more adipose tissue than in males, especially after puberty. Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake. Transsexual porn star Wendy Williams has stated that transsexual porn is classified as Straight Specialty. The speed of the hand motion will vary from person to person, although it is not uncommon for the speed to increase as ejaculation nears and for it to decrease during the ejaculation itself. Transsexual pornography features transwomen performers, who typically have male genitalia and augmented female breasts . Well-known female porn stars who expressed their pleasure in pegging their male partners include Taylor Wane, Debi Diamond, Brittany Andrews, and Monique Covét. These scenes may either have the cameraman directly engaging in sex or merely filming others having sex.