Pornography is often distinguished from erotica, which consists of the portrayal of sexuality with high-art aspirations, focusing also on feelings and emotions, while pornography involves the depiction of acts in a sensational manner, with the entire focus on the physical act, so as to arouse quick intense reactions. Ass to mouth pornography shows the transfer of a performer penis from a second performer anus to that same second performer mouth in a single shot. Tentacle erotica can be consensual, but frequently contains elements hentai videos of non-consensual sex. The scenario momsex is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. The act may be carried out face to face, or head to tail, with the woman recommended to be on top if she has smaller breasts. Pregnancy fetishism is a context where pregnancy is seen by individuals or cultures as an erotic phenomenon. Lolita pornography features women who are 18 years old or slightly older, who pretend to be underage teen girls. This can, however, redirect semen into the bladder . Women that take on the roles of the giantess within this fetish often find the practice to be empowering and enjoy being worshiped. Though there have been numerous gang bang pornographic films since the 1980s, they usually involved no more than half a dozen to a dozen men. The strategies and tactics that are used to smuggle one of the couple into and out of the toilet undetected are as important or almost as important as the urination. Transsexual pornography is a genre of pornography. Terminology for roles varies widely within the various BDSM subcultures. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. The term applies to the depiction gay twink porn of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease.