Bondage websites and bondage imagery in mainstream pornography As of 2003, specialist bondage magazines were mostly displaced by the availability of bondage material on the World Wide Web, and the presence of bondage imagery in mainstream pornographic magazines such as Nugget and Hustler Taboo magazine. In some scenes or relationships it may be impossible for consent to be withdrawn in the middle of a scene, or the bottom may have the ability to revoke consent for a relationship as a whole, but not for a particular scene. Pro-am pornography is sub-genre of amateur pornography that refers to professionally made porn that features amateur actors/actresses, often appearing for the first time in a pornographic film. Some straight actors have started acting in gay porn only to be accused of being gay while others first step was to strictly do solo scenes. Target audience are teenage / young adult women. Typically featured are hitting, choking, name-calling and hair-pulling. A related term used in the genre is the term cougar, which implies an older woman as predator. These actors often play the top roles but this is not always the case, such as with Kristen Bjorn and some Bel Ami models. Internationally, hentai is a catch-all gay hentai term gay cock to describe a genre of anime and manga pornography. Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. Transsexual porn star Wendy Williams has stated that transsexual Porn is classified as Straight Specialty. It is typically animated pornography, as the legal age to be featured in a pornographic film in Japan is 18. Several hundred exclusively pegging films were produced, as well as twice as many bisexual and straight films with strap-on scenes. In the gay pornography industry, which uses amateurs as well as professional actors, the term gay-for-pay refers mature milfs to actors labeled or believed to be straight but who engage in same-sex sexual activities for money. Pornography may fall into more than one genre.