What Are the Cs of Homosexualy? - The Atlantic</tle><meta name="scriptn" ntent="Homosexualy might be partly driven by a mother’s immune rponse to her male fet—which creas wh each son she has."/><meta property="kx:tle" ntent="What Are the Cs of Homosexualy? - The Atlantic"/><meta property="kx:scriptn" ntent="Homosexualy might be partly driven by a mother’s immune rponse to her male fet—which creas wh each son she has."/><lk rel="nonil" href="><lk rel="image_src" href="><meta property="article:thor" ntent="><meta name="thor" ntent="Olga Khazan"/><lk rel="ia:markup_url" href="><meta property="article:publisher" ntent="><meta property="article:opn" ntent="false"/><meta property="article:ntent_tier" ntent="metered"/><meta property="article:tag" ntent="sex"/><meta property="article:sectn" ntent="Health"/><meta property="article:published_time" ntent="2016-04-27T15:31:02Z"/><meta property="article:modified_time" ntent="2021-05-12T21:36:16Z"/><meta name="robots" ntent="x, follow, max-image-preview:large"/><meta property="og:tle" ntent="Why Men Wh Olr Brothers Are More Likely to be Gay"/><meta property="og:scriptn" ntent="Homosexualy might be partly driven by a mother’s immune rponse to her male fet—which creas wh each son she has."/><meta property="og:url" ntent="><meta property="og:type" ntent="article"/><meta property="og:image" ntent="><meta property="twter:rd" ntent="summary_large_image"/><lk rel="alternate" type="applitn/rss+xml" tle="The Atlantic" href="/feed/all/"/><lk rel="alternate" type="applitn/rss+xml" tle="Bt of The Atlantic" href="/feed/bt-of/"/><meta name="referrer" ntent="unsafe-url"/><meta name="apple-mobile-web-app-pable" ntent="y"/><meta name="apple-mobile-web-stat-bar-style" ntent="black"/><meta name="apple-mobile-web-app-tle" ntent="The Atlantic"/><meta name="keywords" ntent="groups of female Japane monkeys, intil tws of gay people, olr brothers, pany of other femal, percent chance, aternal birth orr effect, sexual partners, origs of sexual orientatn, human adults report, female Japane maqu, younger brothers, younger sisters, intil tws of gay sons, psychologist Rch Sav-Williams, H-Y antigens, sexual orientatn, Ray Blanchard, male mat, Atlantic ntributor Chandler Burr, strong rrelatn, thors of a mammoth new review paper, Homosexual orientatn, Part of the explanatn, Average prevalence, Y chromosome, exclive accs, homosexual feelgs, fet of her unborn son, Southern Baptists, gay people, animal kgdom, Disney films, mother’s body mounts, equal rights, support anti-gay legislatn, report thors, adoptive brothers, sexual mori, velopment of heterosexual orientatn, female sexual partners, tolerance, Homosexualy, nsistent environmental explanatns, man, people, Studi, femal, gaps, laws, populatns" emID="#keywords"/><meta name="news_keywords" ntent="groups of female Japane monkeys, intil tws of gay people, olr brothers, pany of other femal, percent chance, aternal birth orr effect, sexual partners, origs of sexual orientatn, human adults report, female Japane maqu, younger brothers, younger sisters, intil tws of gay sons, psychologist Rch Sav-Williams, H-Y antigens, sexual orientatn, Ray Blanchard, male mat, Atlantic ntributor Chandler Burr, strong rrelatn, thors of a mammoth new review paper, Homosexual orientatn, Part of the explanatn, Average prevalence, Y chromosome, exclive accs, homosexual feelgs, fet of her unborn son, Southern Baptists, gay people, animal kgdom, Disney films, mother’s body mounts, equal rights, support anti-gay legislatn, report thors, adoptive brothers, sexual mori, velopment of heterosexual orientatn, female sexual partners, tolerance, Homosexualy, nsistent environmental explanatns, man, people, Studi, femal, gaps, laws, populatns"/><meta name="" ntent="health,sex"/><meta name="" ntent="Olga Khazan"/><meta name="" ntent="2016-04-27T15:31:02Z"/><lk rel="preload" as="font" type="font/woff2" href=" crossorig=""/><lk rel="preload" as="font" type="font/woff2" href=" crossorig=""/><lk rel="preload" as="font" type="font/woff2" href=" crossorig=""/><lk rel="preload" as="font" type="font/woff2" href=" crossorig=""/><lk rel="preload" as="font" type="font/woff2" href=" crossorig=""/><script type="applitn/ld+json">{"@ntext":","@type":"NewsArticle","headle":"What Are the Cs of Homosexualy?","alternativeHeadle":"How Olr Brothers Influence Homosexualy","scriptn":"Homosexualy might be partly driven by a mother’s immune rponse to her male fet—which creas wh each son she has.","url":","datePublished":"2016-04-27T15:31:02Z","dateModified":"2021-05-12T21:36:16Z","isAccsibleForFree":false,"hasPart":{"@type":"WebPageElement","isAccsibleForFree":false,"cssSelector":".article-ntent-body"},"publisher":{"@id":"},"maEntyOfPage":{"@type":"WebPage","@id":"},"image":[{"@type":"ImageObject","width":{"@type":"QuantativeValue","unCo":"E37","value":720},"height":{"@type":"QuantativeValue","unCo":"E37","value":405},"url":"},{"@type":"ImageObject","width":{"@type":"QuantativeValue","unCo":"E37","value":1080},"height":{"@type":"QuantativeValue","unCo":"E37","value":1080},"url":"},{"@type":"ImageObject","width":{"@type":"QuantativeValue","unCo":"E37","value":1200},"height":{"@type":"QuantativeValue","unCo":"E37","value":900},"url":"},{"@type":"ImageObject","width":{"@type":"QuantativeValue","unCo":"E37","value":1600},"height":{"@type":"QuantativeValue","unCo":"E37","value":900},"url":"},{"@type":"ImageObject","width":{"@type":"QuantativeValue","unCo":"E37","value":960},"height":{"@type":"QuantativeValue","unCo":"E37","value":540},"url":"},{"@type":"ImageObject","width":{"@type":"QuantativeValue","unCo":"E37","value":540},"height":{"@type":"QuantativeValue","unCo":"E37","value":540},"url":"}],"thor":[{"@type":"Person","name":"Olga Khazan","sameAs":"}],"articleSectn":"Health"}</script><lk rel="preload" as="image" href=" imageSrcSet=" 750w, 828w, 960w, 976w, 1952w" imageSiz="(m-width: 976px) 976px, 100vw"/><meta name="next-head-unt" ntent="62"/><lk rel="preload" href=" as="style"/><lk rel="stylheet" href=" data-n-g=""/><lk rel="preload" href=" as="style"/><lk rel="stylheet" href=" data-n-p=""/><lk rel="preload" href=" as="style"/><lk rel="stylheet" href=" data-n-p=""/><lk rel="preload" href=" as="style"/><lk rel="stylheet" href=" data-n-p=""/><lk rel="preload" href=" as="style"/><lk rel="stylheet" href=" data-n-p=""/><lk rel="preload" href=" as="style"/><lk rel="stylheet" href="><lk rel="preload" href=" as="style"/><lk rel="stylheet" href="><noscript data-n-css=""></noscript><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/><lk rel="preload" href=" as="script"/></head><body><div id="__next"><div data-tegory="story page"><div></div><nav class="Nav_root___6bX9" aria-labelledby="se-navigatn" data-tegory="Se Nav" data-event-module="se nav" id="ma-navigatn"><div class="Nav_maNav__yofcm"><a href="#ma-ntent" class="Nav_skipLk__Evjjd">Skip to ntent</a><h2 id="se-navigatn" class="Nav_visuallyHi__AbSDF">Se Navigatn</h2><div class="Nav_flexContaer__Q3LKQ"><ul class="Nav_leftContaer__cPQgJ"><li class="Nav_navListItem__cEyWT Nav_visuallyHiOnMobile__hxCGG"><a href=" class="Nav_navLk__5SUAA"><svg xmlns=" viewBox="0 0 87.83 134" class="Nav_bigA__XvGGC"><tle>The Atlantic.