Male masturbation may differ between males who have been circumcised and those who have not. Guro or Gore is a genre of Japanese pornography involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. Animal masturbation has been observed in many species, both in the wild and in captivity. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. This may relate to fetishes such as voyeurism or cuckolding. While bondage is a very popular variation within the larger field of BDSM, it is nevertheless sometimes differentiated gay bear porn from the rest of this field. Incest pornography can feature actual relatives, but the gay hentai main type of this pornography simply uses actors of similar looks to suggest family relationship. Can also include auto-fellatio, or performing oral sex on oneself. The wife who enjoys cuckolding her husband is frequently called a hotwife, or a cuckoldress if the man is more submissive. See Gay-for-pay. A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. 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. Since development momporn and pronunciation of the buttocks begins at menarche and declines with age, full buttocks are also a symbol of youth. It is suggested that much of the obscurity and the uncertainties about female ejaculation are related to mixing up these two phenomena. The person receiving anilingus is regarded as the passive partner in the act, and the person performing anilingus is the active partner. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. Depictions of male and female masturbation are common in pornography, including gay pornography.