Insertion in pornography features women inserting various odd objects into their anus or vaginas. Softcore pornography generally contains nudity or partial nudity in sexually suggestive situations, but without explicit sexual activity, sexual penetration or extreme fetishism, while hardcore pornography may contain graphic sexual activity and visible penetration, including unsimulated sex scenes. Bareback sex is physical sexual activity, especially sexual penetration, without the use of a condom. 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. Emetophilia pornography involving vomiting and gagging. The term hentai is never used in this context in Japanese. A facial is a form of non-penetrative sex, though it is generally performed after some other means of sexual stimulation, momsex such as vaginal sex, anal sex, oral sex or masturbation. The anus has a relatively high concentration of nerve endings and can be an erogenous zone, and the receiver may receive pleasure from external anal stimulation. However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. Interracial pornography typically employs ethnic and racial stereotypes hentai porn in its depiction of performers and many of interracial pornographic films still include racial stereotypes, gay boy porn although the segregation of actors by race has diminished considerably. It is also often mixed with other fetishes in practice, such as voyeurism, denial, etc. Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake. While most tentacle erotica is animated, there are also a few live-action movies. See Gay-for-pay. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen.