Works in this genre may explore philosophical, political or social issues. Penetration may involve use of fingers, toes, sex gay twink porn toys, or penises. The most successful animated features produced in the United States primarily for adult audiences were directed by Ralph Bakshi, including Fritz the Cat, Heavy Traffic and Coonskin. Particularly, some pornography in this genre features butch women, who are almost never seen in mainstream pornography. Sadomasochistic scenes sometimes reach a level that appear more extreme or cruel than other forms of BDSM—for example, when a masochist is brought to tears or is severely bruised—and is occasionally unwelcome at BDSM events or parties. Gay pornography is the representation of sexual activity between males. Medical pornography involves sexualized medical, often fake, including gynecological pelvic examinations, rectal examinations, and pelvic or gynecological ultrasounds. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. Top and dominant are widely recognized for those partner in the relationship or activity who are, respectively, the physically 3d hentai active or controlling participants. For a foot fetishist, points of attraction include the shape and size of the foot and toes , jewelry , treatments , state of dress , odor, and sensory interaction . A facial is a term for the sexual activity in which a man ejaculates semen onto the face of one or more sexual momporn partners. The term breast fetishism is also used to refer to cultural attention to female breasts and the sexuality they represent, with debate continuing as to whether the modern widespread fascination with breasts among heterosexual males in western societies is a sexual fetish. As women, they face concerns separate from men. Production of such films was profitable, and a number of producers specialised in their production. There are various subcultures under this umbrella term and distinct difference between these subcultures. A study of the condom usage habits of New Zealand sex workers said that they offered various safe sex alternatives to vaginal sex to clients who refused to wear a condom.