Irene is excited to learn about the link between sexual orientation and siblings.The studies she has reviewed have found that,on average,gay men have a greater number of ________.

Question

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The studies reviewed by Irene have found that, on average, gay men have a greater number of older brothers. This phenomenon is known as the fraternal birth order effect and suggests that the more older brothers a man has, the more likely he is to be gay.

Irene Is Excited to Learn About the Link Between Sexual