Of all the issues explored in anthropological, social and behavioral sciences, homosexuality perhaps is most controversial and has evoked more arguments and strong feelings in the general public. Homosexuality is often associated wit anger, love, intimacy, hostility, strong negative attitudes (e.g., severe discrimination and violence), and compassion. This subject involves many things: gender identity and orientation, a way of behaving intimately, a wide range of sexual preferences, a stigma, and a badge of pride and self-assertion. One objective of this paper is to clarify the meanings of homosexuality as well as its psychological, behavioral, and social correlates. Most research on homosexuality has taken the individual as the focus of analysis. A. C. Kinsey’s pioneering work investigated the sexual behaviors of the individual and used biographical information to locate the person on a continuum from exclusive homosexuality to exclusive heterosexuality. Other individualistic approaches include studies of the homosexual identity, personality characteristics, subjective well-being, and life histories of gay men and lesbians. Sociocultural analyses, typically undertaken by anthropologists, historians, and sociologists, focus on the societal patterns of homosexuality. Sociocultural researchers seek to describe and explain societal reactions to homosexuality, cultural and subcultural variations in homosexuality, social rules and institutions that regulate homosexuality, etc. In contrast, a relationship perspective takes as the central phenomenon of interest the sexual and romantic relationships that occur between same-sex partners. During the past decades, the prevalence of negative stereotypes against homosexuality has been reduced substantially in most Western societies. Nevertheless, concern remains about the occurence of negative stereotyping attitudes and homophobia in some segments of the general population. Therefore, homosexuality will be analyzed in relation to heterosexism, homophobia, and sexual prejudice.