Such documents have not been recognized as being legally binding, nor are they intended to be. 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. Being forced to wear diapers as a form of humiliation is sometimes a behavior encountered in sexual masochism. Locks may be used to emphasize the submissive position or the submissive hands may be fastened above his head to the box. Bear features a combination of middle-aged, hairy or gay bear porn overweight males. Group sex also occurs in populations of non-human animals such as bonobo apes and chimpanzees. In the Diagnostic and Statistical Manual of Mental Disorders , published by the American Psychiatric Association, it is classified under 302.89 – hamster mobile porn Paraphilia NOS and has no diagnostic criteria other than a general statement about paraphilias that says the diagnosis is made if the behavior, sexual urges, or fantasies cause clinically significant distress or impairment in social, occupational, or other important areas of functioning. In some creampie films, both gay and straight, intercourse and internal ejaculation are followed by performers licking up the semen that has dripped from their bodies. Breeding is sometimes followed by felching, which involves sucking the semen from the partner anus. Crush pornography features objects being crushed by an actress or actor, who generally plays an overtly dominant role. Cartoon pornography includes, but is not limited to, hentai videos hentai milf fuck and parody renditions of famous cartoons and comics. A woman can use a secondary vibrator, between the dildo and her genitals, to get pleasure from pegging. Such works have also often been naked celebrities subject to censorship and other legal restraints to publication, display or possession. 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.