Definition
Sexual orientation is an enduring pattern of emotional, romantic, and sexual attraction toward people of a particular gender or genders. The major orientations recognized in mainstream psychology — heterosexual, homosexual, bisexual, and asexual — describe the typical direction and intensity of an individual's attraction, not their identity labels, behavior, or community affiliation, though those often align. Orientation is distinguished from gender identity, which concerns a person's internal sense of being a man, woman, both, or neither, and from sex assigned at birth, which is based on observable anatomical features.
Alfred Kinsey, in mid-twentieth-century research, was among the first to insist that orientation is best represented as a continuum rather than as discrete categories, and contemporary measurement often uses multidimensional scales that distinguish attraction, behavior, and identity. The consensus across major psychological and psychiatric organizations is that the range of sexual orientations represents a normal variation in human experience and is not in itself associated with any psychological disorder.
Why it matters
How it works
The origins of sexual orientation are best understood as multifactorial rather than reducible to a single cause. Twin and family studies show a moderate genetic component, prenatal hormonal exposure during specific developmental windows has been implicated in patterns of brain differentiation, and there is no credible evidence that parenting style, early childhood experience, or social influence determines orientation. Most people report awareness of their attractions emerging in late childhood or early adolescence, well before any consciously chosen identity, and attempted "conversion" interventions have been shown to be ineffective and frequently harmful, leading every major medical and psychological body to oppose them.
Once identity is established, the developmental task often involves coming out — the staged process of disclosing one's orientation first to oneself and then to others. This unfolds differently across cultures and across cohorts; younger generations in supportive environments tend to come out earlier and with less distress than earlier cohorts did. Psychologists distinguish carefully between the orientation itself, which is not a problem, and minority stress, which is — the chronic stigma, discrimination, and concealment burden that produces measurable elevations in rates of depression, anxiety, and suicidality among sexual minorities. Affirmative therapy, supportive families, and inclusive policy are the principal protective factors.