Research has observed differences in basic body structure and physiological function among individuals of different sexual orientations, supporting the conclusion that sexual orientation is biologically based.

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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.

Physiological Differences Across Sexual Orientations

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

Scientific research reports differences in both brain structure and brain function among individuals of different sexual orientations, providing neurological evidence of an underlying biological basis.

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