the one-way discrimination from heteronormative society that is faced by homosexuals. It is also argued that such two-way discrimination causes many bisexuals to hide their bisexuality to an even greater extent than homosexuals hide their sexuality, leading to underestimations of the prevalence of bisexuality especially in men for whom such assumptions of "really being completely gay" are the most rampant. In the book Bi: Notes for a Bisexual Revolution, Shiri Eisner (2013) mentions Miguel Obradors-Campos' argument that bisexual individuals endure stigma by heterosexuals as well as gay and lesbian individuals. Eisner (2013) also writes, "some forms of biphobic stigma frequently observed in gay and lesbian communities: that bisexuals are privileged, that bisexuals will ultimately choose heterosexual relationships and lifestyles, that bisexual women are reinforcing patriarchy, that bisexuality is not a political identity, that bisexual women carry HIV to lesbian communities, and so on." Negative stereotypes Many stereotypes about people who identify as bisexual stem from denial or bisexual erasure. Because their orientation is not recognized as valid, they are stereotyped as confused, indecisive, insecure, experimenting, or "just going through a phase". The association of bisexuality with promiscuity stems from a variety of negative stereotypes targeting bisexuals as mentally or socially unstable people for whom sexual relations only with men, only with women, or only with one person at a time is not enough. These stereotypes may result from cultural assumptions that "men and women are so different that desire for one is an entirely different beast from desire for the other" ("a defining feature of heterosexism"), and that "verbalizing a sexual desire inevitably leads to attempts to satisfy that desire." As a result, bisexuals may bear a social stigma from accusations of cheating on or betraying their partners, leading a double life, being "on the down-low", and spreading sexually transmitted diseases such as HIV/AIDS. This presumed behavior is further generalized as dishonesty, secrecy, and deception. Bisexuals can be characterized as being "slutty", "easy", indiscriminate, and nymphomaniacs. Furthermore, they are strongly associated with polyamory, swinging, and polygamy, the last being an established heterosexual tradition sanctioned by some religions and legal in several countries. This is despite the fact that bisexual people are as capable of monogamy or serial monogamy as homosexuals or heterosexuals. Effects The mental and sexual health effects of biphobia on bisexual people are numerous. One study showed that bisexuals are often trapped in between the binaries of heterosexuality