The study also found that participants reacted positively to a much wider range of figures than a control group, even rating emaciated figures higher. Coprophilia , also called hot gay sex scatophilia or scat , is the paraphilia involving sexual arousal and pleasure from feces. Standing up, a chair, the corner of an item of furniture, or even a washing machine can be used to stimulate the clitoris through the labia and clothing. A study of 164 males in Finland from two SM clubs found that 18.2% had engaged in coprophilia; 3% as a sadist, 6.1% as a masochist, and 9.1% as both. 18% of heterosexuals and 17% of homosexuals in the study pool had tried coprophilia, showing no statistically significant difference between heterosexuals and homosexuals. Lolita pornography caters to ephebophiles. In general, as compared to conventional relationships, BDSM participants go to great lengths to negotiate the important aspects of their relationships in advance, and to take great care in learning about and following safe practices. Gonzo pornography is a style of pornographic film that attempts to place the viewer directly into the scene. These include gently sucking and tugging on the scrotum and use of lips to ensure minimal contact with their teeth. Reading or viewing pornography, sexual fantasy or other erotic stimuli may lead to a desire for sexual release such as by masturbation. This genre also features male-on-male fellatio through a small hole anime hentai made in a bathroom divider. It is the most common form of sexual fetishism for otherwise big tit milf non-sexual objects or body parts. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. The activity is done by itself or as a part of or prelude to other activities which many times involve sex. Top and dominant are widely recognized for those partner in the relationship or activity who are, respectively, the physically active or controlling participants. The mouth was the most common area to be ejaculated upon.