Shemale is a term primarily used in sex work to describe a trans woman with male genitalia combined with female secondary sex characteristics, usually including augmented female breasts, from breast augmentation and/or use of hormones. The person receiving anilingus is regarded as the passive partner in the act, and the person performing anilingus is the active partner. A large part of the popularity of these videos is seeing how regular and normal the girls are in real-life. Spanking or whipping pornography involves spanking or whipping, generally of the buttocks, with the hand or with other objects such as belts, switches, paddles, brushes, or whips. Along with the penis, the scrotum is sensitive and considered to be an erogenous zone. Emetophilia pornography involving vomiting and gagging. Real jail or prison or police station shots or videos may violate laws in some countries. Mammary intercourse is said by Alex Comfort to produce mutual orgasm in women with sensitive breasts , and it was one of the nine substitute exercises for penetrative sexual activities, as detailed in the Paradis Charnels of 1903. This is commonly called double anal or double stuffing. Sometimes special furniture is used, such as a queening stool or smotherbox. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings. Hugo Ohira, director of marketing for Silvercash, rhetorically asks Who does not like spewing their load on a pretty young face? Sloppy seconds is a slang phrase for when a man has sexual intercourse with another person who already has received another man penis in the relevant orifice and is therefore wet or sloppy. Gonzo porn is influenced by amateur pornography, gay movies and it tends to use far fewer milf xxx full-body/wide shots in favor of more close-ups . For other diaper fetishists, hentai videos simply wearing a diaper, the bulking feeling and crinkling sounds associated with it, is enough to cause the fetishist a form of erotic pleasure or sexual arousal.