Your book describes research revealing that sexual orientation in males is predicted the number of siblings one has, regardless of whether they grew up in the same household. What did the study authors conclude?

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The study authors concluded that factors associated with the prenatal environment may explain sexual orientation. The number of older brothers a male has, regardless of whether or not they grew up in the same household, was found to predict sexual orientation, suggesting that something about the prenatal environment may be influencing sexual orientation. The study did not conclude that the environment has very little effect or that genetics are largely responsible for sexual orientation.

Your Book Describes Research Revealing That Sexual Orientation in Males