In gay pornographic lesbian hentai 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. There is a substantial amount of incest pornography on the Internet, leading some to argue it may legitimize or encourage real-life incest. 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. Initially, few animation studios in the United States attempted to produce animation for adult audiences, but later examples of animation produced for adults would gain mainstream attention and success. A smotherbox gay boy porn has two openings. Fisting involves the insertion of one partner entire hand into a vagina or the anal cavity. Simultaneous penetration of the vagina by two penises or other objects. In the United States, creating, distributing, or possessing crush videos has been illegal since 1999, and many other countries also have banned them. Some couples use a threesome as a way to develop a love triangle . 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. A variant of this is known as ATOM or ATOGM where the insertive partner removes his penis from one recipient anus and inserts it into a second recipient mouth. Along with the penis, the scrotum is sensitive and considered to be an erogenous zone. In many cases, that person is also aroused by smelling body big tit milf parts that have a urine scent. In the 1970s, the hardcore pornography genre introduced the stereotypical cumshot scene as a central element of the hardcore film, in which the male actor ejaculates in a way ensuring maximum visibility of the act itself.