Shotacon : Similar to Lolicon, this genre involves prepubescent or under-aged boys between the ages 6–12. Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. Top and dominant are widely recognized for those partner in the relationship or activity who are, respectively, the physically active or controlling participants. Masturbation is the self-sexual stimulation of the genitals for videos gays sexual arousal or other sexual pleasure, usually to the point of orgasm. While some fantasize about a giantess who is slightly taller than himself, others are interested in giantesses that are hundreds or even thousands of feet tall. 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 of non-human animals such as bonobo apes and chimpanzees. Mammary intercourse is known as titty-fucking, titfuck, or a titjob in the United States, as well as tit wank or French fuck in the United Kingdom - the latter term dating back to the 1930s; while a more jocular equivalent is a trip down mammary lane. The cover can have hinges or be a separate part. Breast fetishism is a paraphilic sexual interest focused on female breasts . Cartoon pornography is the portrayal of illustrated or animated fictional characters in erotic or sexual situations. A woman can use a secondary vibrator, between the dildo and her genitals, to get pleasure from pegging. Positions can also be chosen specifically for added effects such as increased humiliation, elevation and suspension. The consensual submission of the submissive is sometimes demonstrated to others by symbols indicating his/her belonging to the dominant, such as wearing a collar, special tattoos, piercings, a very short haircut or a bald head. As well as traditional milf xxx attraction, the topic also incorporates feederism and gaining, where hentai sex sexual gratification is obtained via the process of gaining body fat.