Homosexuality is an evolutionary paradox in search for a resolution, not a medical condition in search for a cure. Homosexual behavior is common among social animals, and mainly expressed within the context of a bisexual sexual orientation. Exclusive homosexuality is less common, but not unique to humans. Poiani and Dixson invite the reader to embark on a journey through the evolutionary, biological, psychological and sociological aspects of homosexuality, seeking an understanding of both the proximate and evolutionary causes of homosexual behavior and orientation in humans, other mammals and birds. The authors also provide a synthesis of what we know about homosexuality into a biosocial model that links recent advances in reproductive skew theory and various selection mechanisms to produce a comprehensive framework that will be useful for anyone teaching or planning future research in this field.

' … a truly monumental compendium of everything you might have wanted to know about same-sex biology, its proximate as well as ultimate causation … a goldmine … with a treasure-trove of many hundreds of references … Aldo Poiani, in this admirable volume, has drawn together the best, most coherent summary to date of the currently available evidence.'

Source: Evolutionary Psychology

… [a] remarkable new book … a well-presented and easily navigated text. … it precisely reflects the strongest conclusion that the current literature can make: animal homosexuality can only be understood as a diverse collection of multicausal phenomena. Importantly, it is this firm commitment to an integrative and pluralistic perspective that marks out Poiani's contribution to the literature.'

Source: Animal Behaviour