The term hentai is never used in this context in Japanese. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. Performers are usually clean-shaven, thinner and more effeminate than ones in mainstream gay pornography. Lesbianism has been a theme in erotic art since at least the time of ancient Rome, and many regard depictions of lesbianism to be erotic. Enema pornography involves adults given enemas to others, often fake. 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. Bhabha, Anne McClintock and Kobena Mercer. Unlike the traditional definition of the term, in fetish usage a cuckold is complicit in their partner sexual infidelity and takes masochistic sexual pleasure in it. Facial cum shots are currently regularly portrayed in pornographic anime hentai films and videos, often as a way to close nude milfs a scene. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections . Boot fetishism is a sexual fetish dedicated to boots. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and gay twinks then shuttle them back and forth. In the context of consensual erotic activities, sadism and masochism are not strictly accurate terms; there is a significant difference from the medical or psychological usage of both terms. See Gay-for-pay. This technique may include the use of a simulacrum, or artificial vagina. While bondage is a very popular variation within the larger field of BDSM, it is nevertheless sometimes differentiated from the rest of this field. It may be regarded as taboo or unnatural, and is a criminal offense in some countries, punishable by corporal or capital punishment; by contrast, people also regard anal sex as a natural and valid form of sexual activity that may be as equally fulfilling as any other desired sexual expression.