Japanese rope bondage is distinguished by its use of specific katas and aesthetic rules. In gay pornographic movies, actors who identify themselves as heterosexual, but who nevertheless perform explicit sexual acts with other males on film do not face the same stigmas as the mainstream acting counterparts and indeed can rise quickly to being featured actors. Another variant of reality pornography consists of normal couples that are filmed by professionals, in which case the only obvious distinction from amateur pornography is the higher quality of production, filming and editing. The nipples are erogenous zones, and vigorous stimulation of them during masturbation usually causes the penis to become erect more quickly than it would otherwise. In general, softcore pornography is pornography that does not depict explicit sexual activity, sexual penetration or extreme fetishism. The interaction between tops and bottoms—where physical or mental control of the gay fuck bottom is surrendered to the top—is sometimes known as power exchange, whether in the context of an encounter or a relationship. 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. Sexual scenarios may involve male domination, female submission, milf xxx exhibitionism and erotic entertainment. BDSM has become an umbrella term for certain kinds of erotic behavior between consenting adults. Sex experts have hentai porn praised various techniques that the performer can use during fellatio to increase their partner pleasure. Homi Bhabha defined the idea of a racial fetish in contrast to the idea of the Freudian sexual fetish which he describes a denial of difference, where the male sees the female as a castrated male, seeing missing parts rather than a different anatomy. 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.