Today, guest host <a href="https://www.npr.org/people/349308023/selena-simmons-duffin"target="_blank" >Selena Simmons-Duffin</a> is exploring a detail very personal to her: How the number of older brothers a person has can influence their sexuality. Scientific research on sexuality has a dark history, with long-lasting harmful effects on queer communities. Much of the early research has also been debunked over time. But not this "fraternal birth order effect." The fact that a person's likelihood of being gay increases with each older brother has been found all over the world – from Turkey to North America, Brazil, the Netherlands and beyond. Today, Selena gets into all the details: What this effect is, how it's been studied and what it can (and can't) explain about sexuality. Interested in the science of our closest relatives? Check out more stories in NPR's series on <a href="https://www.npr.org/series/1241438370/the-science-of-siblings"target="_blank" >the Science of Siblings</a>. Email us at <a href="mailto:shortwave@npr.org"target="_blank" >shortwave@npr.org</a> — we'd love to hear from you. Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at <a href="http://plus.npr.org/shortwave"target="_blank" >plus.npr.org/shortwave</a>. To manage podcast ad preferences, review the links below: See <a href="https://pcm.adswizz.com">pcm.adswizz.com</a> for information about our collection and use of personal data for sponsorship and to manage your podcast sponsorship preferences. Learn more about sponsor message choices: <a href="https://podcastchoices.com/adchoices">podcastchoices.com/adchoices</a> <a href="https://www.npr.org/about-npr/179878450/privacy-policy">NPR Privacy Policy</a>

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Sibling order may affect sexuality and identity

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