Previous research has identified a range of perceptual voice and speech features that differ between gay and straight men, enabling listeners to determine if a man is gay or straight at a rate better than chance from his voice alone. To date, no published studies have examined if bisexual men's voices differ from gay and straight men's voices with regard to perceived masculinity-femininity - nor whether listeners can identify a bisexual man based only on his voice. In the present study, we examined if listeners could identify bisexual men's sexual identities from voice recordings. Seventy participants (N= 70) rated 60 voice recordings of a sample of 20 gay, 20 bisexual, and 20 straight Australian men on perceived sexual orientation and degree of masculinity-femininity. Participants could correctly categorize the sexual orientations of the gay and straight speakers at rates greater than chance, but bisexual men were only identified at chance. Bisexual voices were consistently misperceived as being the most exclusively female attracted, and, contrary to expectations, were perceived as the most masculine sounding of all the speakers. Together, these findings suggest that while the voices of bisexual men in our sample were perceived as more masculine and female attracted, listeners do not associate this impression with bisexuality, and thus cannot identify bisexual men from their voices. Consequently, while bisexual men appear to be at lower risk of facing voice-based identification and discrimination than gay men, they may be often misperceived as being straight.