GAY TRUTH

Sexual Orientation  Lawrence S. Mayer ,   Paul R. McHugh While some people are under the impression that sexual orientation is an innate, fixed, and biological trait of human beings — that, whether heterosexual, homosexual, or bisexual, we are “born that way” — there is insufficient scientific evidence to support that claim. In fact, the concept of sexual orientation itself is highly ambiguous; it can refer to a set of behaviors, to feelings of attraction, or to a sense of identity. Epidemiological studies show a rather modest association between genetic factors and sexual attractions or behaviors, but do not provide significant evidence pointing to particular genes.  There is also evidence for other hypothesized biological causes of homosexual behaviors, attractions, or identity — such as the influence of hormones on prenatal development — but that evidence, too, is limited. Studies of the brains of homosexuals and heterosexuals have found some differences,...