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. It is also often mixed with other fetishes in practice, such as voyeurism, denial, etc. Cum swapping pornography involves performers trading semen between their mouths. Interracial pornography typically employs ethnic and racial stereotypes in its depiction of performers and many of interracial pornographic films still include racial stereotypes, although the segregation of actors by race has diminished considerably. The higher pay scale and profile within a production gay boy porn often leads to group scenes where a straight actor only tops. Body parts including fingers, tongue and penis may be used for anonymous oral, vaginal and/or anal intercourse. The other is in the top of the box to expose their face. It may be regarded as taboo or unnatural, and is a criminal offense in some countries, punishable by corporal or capital punishment; by contrast, people also regard anal sex as a natural and valid form of sexual activity that may be as equally fulfilling as any other desired sexual expression. POV pornography involves camera angles designed to provide the viewer a view similar to that seen by one of the participants, whose face is never shown. Rape itself is a crime in many countries. High heel pornography involves women or men dressed in high heeled shoes. Since at least 1973, it has also been used to refer to a sexually attractive young woman. The interaction between tops and bottoms—where physical or mental control of the bottom is surrendered nude milfs to the top—is sometimes known as power exchange, whether in the context of an encounter or a relationship. They cited the Internet and text messaging as common ways of organising meetings. Erotic literature and pornographic films have been devoted to the sexual uses of glory holes. The padding may also muffle noises from the outside, lesbian hentai causing a relaxation effect and heightening their other senses.