Is also common of the furry genre. In some scenes or relationships it may be impossible for consent to be withdrawn in the middle of a scene, or the bottom may have the ability to revoke consent for a relationship as a whole, but not for a particular scene. 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. The wife who enjoys cuckolding her husband is frequently called a hotwife, or a cuckoldress if the man is more submissive. The most common type of erotic spanking is administered on the bare buttocks, but can also be combined with bondage, in order to heighten sexual arousal and feelings of helplessness. The first explicit pegging scene is believed to have been in the 1975 pornographic film The Opening of Misty Beethoven. Older names for a pornographic film include stag film, and blue movie. It is also known colloquially as gushing or squirting, although these are considered to be different phenomena in some research publications. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. A pornographic work is characterized as hardcore if it has any hardcore content, no matter how small. Solo pornography recognized with AVN Awards include the All Alone series and All Natural: Glamour Solos. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. Real medical shots or videos may violate privacy laws in some countries. The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. The arousal from being desperate comes from the sensation of gaysex having a full bladder. As of 2013, little analysis of this paraphilia hentai movies has been reported in medical literature.