The book is divided into three sections. Part 1 is a thorough overview of pertinent background information about gay, lesbian, and bisexual adolescents. Complex definitions of sexual orientation, behavior, and identity development are explained as clinically applicable. For example, because of the vicissitudes of identity development, gay and lesbian youth are not likely to present initially as such to a primary care or mental health practitioner. In one study, 5% of surveyed youth reported homosexual behavior but only 1% identified themselves as homosexual. Clinicians who treat adolescents need to be particularly conscious of not making assumptions about heterosexuality.