The introduction of the home video and Internet saw a boom in the worldwide porn industry that generates billions of dollars annually. Breeding is sometimes followed by felching, which involves sucking the semen from the partner anus. Some POV/gonzo porn sometimes breaks the strict point-of-view convention. Such documents have not been recognized as being legally binding, nor are they intended to be. On the other hand, the masochist enjoys being hurt, humiliated, or suffering within the consensual scenario. Biological anthropologist Helen B. Reading or viewing pornography, sexual fantasy or other erotic stimuli may lead to a desire for sexual release such as by masturbation. HIV is among the infections that require such direct contact and is therefore very unlikely to be transmitted via mammary intercourse. As a form of non-penetrative sex, it can be done hentai porn for its own enjoyment or as foreplay. As the prostate is touch-sensitive, some directly stimulate it using a well-lubricated finger or dildo inserted through the anus into the rectum. Concerted deployed sexual rejection exercised on the partner can be an aspect of Dominance and Submission as well. Snowballing or snowdropping is the human sexual practice in which one person takes someone else semen into his or her mouth and then passes it to the mouth of the other, usually through kissing. Group sex also occurs in populations videos porno gay of non-human animals such as bonobo apes and chimpanzees. A 2009 study found that heterosexual male fat admirers preferred females that were clinically overweight and rated both overweight and obese women more positively than slighter individuals. As well as traditional attraction, the topic also incorporates feederism and gaining, where sexual gratification is obtained via the process of gaining body fat. Reality and voyeur pornography, animated videos, and legally prohibited acts also influence the classification of pornography. Positions momsex can also be chosen specifically for added effects such as increased humiliation, elevation and suspension.