The range of its individual characteristics is thereby wide. The inside of a smotherbox is often padded to provide support for their neck and prevent their head from moving. Examples include the Girls Gone Wild and Girls Who Like Girls Series. Bisexual pornography is a genre of pornography which most typically depicts one woman and two men who all perform sex acts on each other. Commercialized pornography accounts for a nearly US0 billion worldwide industry for the production of various media gay movies and associated products and services. Bukkake is a sex act portrayed in pornographic films, in which several men ejaculate hentai movies on a woman, or another man. Mutual masturbation can be practiced by males or females in pairs or groups with or without actually touching another person as indicated by the following examples of contact versus non-contact scenarios: Non-contact mutual masturbation Two people masturbating in the presence of each other but not touching. Common positions include lying on back or face down, sitting, squatting, kneeling or standing. Oral sex pornography frequently features a person performing fellatio, and less frequently cunnilingus. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films. The current record is held by Lisa Sparks who had sex with 919 men on October 16, 2004 in Warsaw, Poland as part of the Third Annual World Gangbang Championship and Eroticon 2004. Stimulating the prostate from outside, via pressure on the perineum, can be pleasurable as well. Spanking can be administered in a number of spanking positions. 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. Pegging is a sexual practice in which a woman performs anal sex on a man by penetrating the man anus with a strap-on dildo. Typically featured are hitting, milf fuck choking, name-calling and hair-pulling.