Research demonstrates significant gene-level contributions to sexual orientation. Some estimates suggest that genes account for at least half of the variability observed in human sexual orientation, supporting the idea that it has a strong biological component.

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Sexual orientation is understood to be shaped by a combination of factors. While environmental influences like family background and socialization were once thought to be primary determinants, research has consistently refuted this idea. In contrast, a significant body of evidence points to an underlying biological component, supported by findings in genetics, brain structure, and basic physiology. This suggests that sexual orientation is, to a large extent, an innate trait with which individuals are born.

Biological and Environmental Influences on Sexual Orientation

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

A client tells their therapist that they believe their son's sexual orientation was caused by the friends he had in high school. The client is worried their younger child will be similarly 'influenced.' Based on the current scientific consensus, how should the therapist evaluate the client's concern?

Research has consistently demonstrated that familial experiences and family backgrounds are very similar among heterosexual individuals and LGBTQ individuals. This evidence refutes the previously common belief that sexual orientation is largely determined by socialization and familial experiences.

Similarity of Family Backgrounds Across Sexual Orientations

Genetic Contributions to Sexual Orientation

Studies indicate that there are measurable physiological differences among individuals of different sexual orientations. These include differences in brain structure and function, as well as variations in basic body structure and function, which collectively suggest an underlying biological basis for sexual orientation.

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