women for the majority of men, but there is a substantial minority who may experience it as their sexual orientation." A 2016 study that used the penile plethysmograph demonstrated that the arousal patterns, genital and subjective, of men who report attraction to transgender women who have "female-typical physical characteristics (e.g. breasts) while retaining a penis" are similar to those of straight men and different from those of gay men. The study showed that these men are much more aroused to female than to male stimuli. They differed from both the groups of straight and gay men, however, in also displaying strong arousal to stimuli featuring trans women, to which they responded as much as to the cisgender female stimuli. Of the men attracted to trans women, 41.7% identified as bisexual, with the remainder identifying as straight. The bisexuals among them did not display significantly more arousal to male stimuli than their heterosexual counterparts, though they did report a higher number of male sex partners. A 2019 study that asked 958 participants which gender identities they would be interested in dating found that 96.7% of heterosexual men, 98.2% of heterosexual women, 88.5% of gay men, 71.2% of lesbian women, and 48.3% of bisexual, queer, and non-binary participants reported that they would not be interested in dating a transgender person, and the remainder would be interested. Social views Erotic materials created for people attracted to trans men have become more visible, especially due to pornographic actor Buck Angel. Trans activist Jamison Green writes that cisgender gay men who are partnered with trans men "are often surprised to find that a penis is not what defines a man, that the lack of a penis does not mean a lack of masculinity, manliness, or male sexuality". Gay author Andrew Sullivan has criticized the idea that gay men should necessarily be attracted to trans men, arguing that sexual orientation is based on biological sex, not gender identity. Terminology A variety of casual terms have developed to refer to people who are attracted to transgender people. These terms include trans-attracted, trans-oriented, transfan, trans admirer, and trans catcher. The terms transromantic, transamorous and transsensual have also emerged, but have not seen much usage. The terms tranny chaser (sometimes shortened to chaser) and tranny hawk have been used, although tranny is considered a slur by many. The term chaser is predominantly used to describe men sexually interested in