This is commonly called double anal or double stuffing. Social attitudes towards the discussion and presentation of sexuality has become more tolerant and legal definitions of obscenity have become more limited, leading to an industry for the production and consumption of pornography in the latter half of the 20th century. Other forms of anal sex include fingering, the use of sex toys for anal penetration, oral sex performed on the anus , and pegging. Freud, however, considered such extensions of sexual interest to fall within the range of the normal, unless marked out by exclusivity . Human urinal: An act common in the bondage sex community gaysex where a male or female slave will serve as a urinal for a dominant partner. They are often made out of precious woods, with leather used for the seat. Instead, lesbian relationships have often been regarded as harmless and incomparable to heterosexual ones unless the participants attempted to assert privileges traditionally enjoyed by men. Scenes of multiple penetration are common in pornography. Interracial pornography typically employs ethnic and racial stereotypes in its depiction of performers and many of interracial pornographic films still include racial stereotypes, although the segregation of actors by race has diminished considerably. Cum swapping pornography involves performers trading semen between their mouths. Strappado with rope and a spreader bar. This is sometimes the case for punishment scenes between master/slave couples or for some extreme or edgeplay scenes which may include abductions, rape play, or interrogation. Asian fetish is a slang term which usually refers to an interest, strong attraction lesbian hentai or preference for people, culture, or things of Asian origin by those of non-Asian descent. Exhibitionist pornography features performers, usually female milf xxx exposing themselves in public and spans simple flashing to public sex. Rape itself is a crime in many countries. Pornography is the portrayal of sexual subject matter for the purpose of sexual arousal.