Creampie scenes depart from heterosexual pornographic convention in favor of a depiction that more closely mimics sexual intercourse as performed in ordinary life; they have been called the counterimage of facials. The consent and compliance for a sadomasochistic situation can be granted only by people who can judge the potential results. Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider. Reality pornography is professionally made porn which seeks to emulate the style of amateur pornography. There may be more than two participants; both group sex and gang banging can be included. Transgender pornography features performers who cross-dress for sexual gratification, either for themselves or for their partners. If ejaculation is onto the momporn other person face it can be called a facial. Transsexual porn star Wendy Williams has stated that transsexual porn is classified as Straight Specialty. The term discipline describes psychological restraining, with the use of rules and punishment to control overt behavior. The Silent Duck, also called Duck-Billing, is the technique often used in which the person engaging in hand insertion shapes the hand to resemble a duck beak. Group sex is sexual behavior involving more than two participants. Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed. A variant of A2M is ATOM where a performer inserts his penis directly from one recipient anus into a second recipient mouth. It spawned numerous sequels, several of which won adult film awards. Films with risqué content commenced to be produced soon after the invention of the motion picture in the 1880s. Saliva anime hentai pornography involves salivation gay twinks and saliva. Foot fetish pornography features heavy emphasis on the feet of the participants, either in combination with kissing and genital sex or in the context of acts such as trampling or crush fetishism.