Depicted as duplicitous, traitorous, and promiscuous, bisexuality has long been suspected, marginalized, and rejected by both straight and gay communities alike. Bi takes a long overdue, comprehensive look at bisexual politics—from the issues surrounding biphobia/monosexism, feminism, and transgenderism to the practice of labeling those who identify as bi as either “too bisexual” (promiscuous and incapable of fidelity) or “not bisexual enough” (not actively engaging romantically or sexually with people of at least two different genders). In this forward-thinking and eye-opening book, feminist bisexual and genderqueer activist Shiri Eisner takes readers on a journey through the many aspects of the meanings and politics of bisexuality, specifically highlighting how bisexuality can open up new and exciting ways of challenging social convention. Informed by feminist, transgender, and queer theory, as well as politics and activism, Bi is a radical manifesto for a group that has been too frequently silenced, erased, and denied—and a starting point from which to launch a bisexual revolution.

Shiri Eisner is a feminist bisexual and genderqueer activist, writer, and researcher who is considered a rising star of the international bisexual community and is quickly gaining reputation. After graduating with honors from Tel Aviv University, Eisner spoke internationally and facilitated workshops at both academic and activist conferences, focusing on bisexual politics, theory, and activism, as well as undertaking an in-depth exploration of current bisexual literature, representation, and research. She is currently pursuing her postgraduate studies while writing this book as the culmination of her reading and research thus far. Eisner has extensive activist experience in the areas of feminism, LGBTQ, anti-war, and animal liberation. In the field of queer activism, she organized and participated in many events, including radical/alternative pride marches, demonstrations, and protest vigils. As a bisexual activist, she is the founder and head of the only bisexual organization in Israel today (and the second ever), Panorama – Bi and Pansexual Feminist Community, a grassroots organization focusing on bisexual community building and activism. In many ways, Eisner is considered to be the founder of the Israeli bisexual movement, as virtually no such movement has existed prior to her founding of Panorama. As such, she is highly regarded by the LGBTQ community on a national (and international) level and is considered a world authority on bisexual issues. Eisner's writing draws heavily on both her academic and her activist background, creating an accessible, political, and well-grounded writing style. Her writings, focusing on bisexuality, have been published internationally in both journalist, activist, and academic contexts. Her English-language blog, Radical Bi, is one of the most popular and well-known English-language blogs about bisexuality; it is referred to internationally on blogs like Bisexual, Pansexual and Queer Community (United States); BiUK (United Kingdom); La Radical Bi (Spain); and Bisexualitaet.org (Germany). Her Hebrew-language blog, Purple-Black, is highly popular as the only blog in Hebrew focusing on this topic. Eisner lives in Tel Aviv, Israel. She regards Bi as an activist project, which she hopes will affect social change.