They may be noted for using risqué themes, graphic violence, sexuality or black comedy in a manner that is unsuitable for younger audiences. Nevertheless, it is only an attempt at phenomenological differentiation. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. Top and dominant are widely recognized for those partner in the relationship or activity who are, respectively, the physically active or controlling participants. A person may be sexually penetrated multiple times simultaneously. See also gay hentai Gay-for-pay. It may occur more frequently in private situations, such as spontaneous sexual activity among three friends, or arranged in a community of like-minded swingers or planned as a once-only experience; and rarely in anonymous settings, such as at orgies or other sex parties. A related term used in the genre is the term cougar, which implies an older woman as predator. No causal relationship is known between masturbation and any form of mental or physical disorder. Some aspects of the research community distinguish between female ejaculation and what is colloquially known as squirting or gushing. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. The queening stool is also gay sex video related to a smotherbox, which also allows the person under the seat to be locked in place, restrained by the neck as in a set of stocks. At the end of the evening the female milf fuck partners would randomly select keys from the bowl and leave with that key owner. Typically features adult, masculine men with varying degrees of muscle, body fat, and body hair, akin to beefcakes, or bears. Breeding is sometimes followed by felching, which involves sucking the semen from the partner anus. The glans itself may widen and lengthen as the stimulation continues, becoming slightly darker in colour, while the gliding action of the foreskin reduces friction. Its gain in prominence has been attributed to its depiction in the film Pecker, which was released in 1998.