The first pegging scene appears to have been in the non-pornographic 1970 film Myra Breckinridge, based on the novel of the same name by Gore Vidal, although it was not explicit. Freud, however, considered such extensions of sexual interest to fall within the range of the normal, unless marked out by exclusivity . Strictly speaking, bondage means binding the partner by tying their appendages together; for example, lesbian milfs by the use of handcuffs or by lashing their arms to an object. Typically features a feminine Uke, or submissive, and a masculine Seme, or dominative. It explores the more mental aspect of BDSM. Sex experts have praised various techniques that the performer can use during fellatio to increase their partner pleasure. Anti-pornography psychologist Ana Bridges and colleagues conducted a content analysis of best-selling heterosexual pornographic videos showing that over 96% of all scenes concluded with a male performer ejaculating onto the body of his female partner. This is sometimes the case for punishment scenes between master/slave anime hentai couples or for some extreme or edgeplay scenes which may include abductions, rape play, or interrogation. Though the term anal sex most commonly means penile-anal penetration, sources sometimes use the term anal intercourse to refer exclusively to penile-anal penetration, and anal sex to refer to any form of anal sexual activity, especially between pairings as opposed to anal masturbation. In a separate article analyzing 12 men who engaged in gay sex video bestiality, an additional analysis of an 11-man subgroup revealed that 6 had engaged in coprophilic behavior, compared with only 1 in the matched control group consisting of 12 SM-oriented males who did not engage in bestiality. This is why video stores might consider stocking transgendered subject matter in the straight section, as some straight men will have passive or active sex with another man as long as their partner appears to look like a woman to them, to some minor or major degree.