同性恋进化之谜
<p><span word="In">In</span> <span word="the">the</span> <span word="last">last</span> <span word="two">two</span> <span word="decades">decades</span>, <span word="dozens">dozens</span> <span word="of">of</span> <span word="scientific">scientific</span> <span word="papers">papers</span> <span word="have">have</span> <span word="been">been</span> <span word="published">published</span> <span word="on">on</span> <span word="the">the</span> <span word="biological">biological</span> <span word="origins">origins</span> <span word="of">of</span> <span word="homosexuality">homosexuality</span> - <span word="another">another</span> <span word="announcement">announcement</span> <span word="was">was</span> <span word="made">made</span> <span word="last">last</span> <span word="week">week</span>. <span word="It">It</span>'<span word="s">s</span> <span word="becoming">becoming</span> <span word="scientific">scientific</span> <span word="orthodoxy">orthodoxy</span>. <span word="But">But</span> <span word="how">how</span> <span word="does">does</span> <span word="it">it</span> <span word="fit">fit</span> <span word="with">with</span> <span word="Darwin">Darwin</span>'<span word="s">s</span> <span word="theory">theory</span> <span word="of">of</span> <span word="evolution">evolution</span>?</p><p><span word="Macklemore">Macklemore</span> <span word="and">and</span> <span word="Ryan">Ryan</span> <span word="Lewis">Lewis</span>'<span word="s">s</span> <span word="hit">hit</span> <span word="song">song</span> <span word="Same">Same</span> <span word="Love">Love</span>, <span word="which">which</span> <span word="has">has</span> <span word="become">become</span> <span word="an">an</span> <span word="unofficial">unofficial</span> <span word="anthem">anthem</span> <span word="of">of</span> <span word="the">the</span> <span word="pro">pro</span>-<span word="gay">gay</span> <span word="marriage">marriage</span> <span word="campaign">campaign</span> <span word="in">in</span> <span word="the">the</span> <span word="US">US</span>, <span word="reflects">reflects</span> <span word="how">how</span> <span word="many">many</span> <span word="gay">gay</span> <span word="people">people</span> <span word="feel">feel</span> <span word="about">about</span> <span word="their">their</span> <span word="sexuality">sexuality</span>.</p><p><span word="It">It</span> <span word="mocks">mocks</span> <span word="those">those</span> <span word="who">who</span> "<span word="think">think</span> <span word="it">it</span>'<span word="s">s</span> <span word="a">a</span> <span word="decision">decision</span>, <span word="and">and</span> <span word="you">you</span> <span word="can">can</span> <span word="be">be</span> <span word="cured">cured</span> <span word="with">with</span> <span word="some">some</span> <span word="treatment">treatment</span> <span word="and">and</span> <span word="religion">religion</span> - <span word="man">man</span>-<span word="made">made</span> <span word="rewiring">rewiring</span> <span word="of">of</span> <span word="a">a</span> <span word="predisposition">predisposition</span>". <span word="A">A</span> <span word="minority">minority</span> <span word="of">of</span> <span word="gay">gay</span> <span word="people">people</span> <span word="disagree">disagree</span>, <span word="maintaining">maintaining</span> <span word="that">that</span> <span word="sexuality">sexuality</span> <span word="is">is</span> <span word="a">a</span> <span word="social">social</span> <span word="construct">construct</span>, <span word="and">and</span> <span word="they">they</span> <span word="have">have</span> <span word="made">made</span> <span word="a">a</span> <span word="conscious">conscious</span>, <span word="proud">proud</span> <span word="choiceto">choiceto</span> <span word="take">take</span> <span word="same">same</span>-<span word="sex">sex</span> <span word="partners">partners</span>.</p><p><span word="But">But</span> <span word="scientific">scientific</span> <span word="opinion">opinion</span> <span word="is">is</span> <span word="with">with</span> <span word="Macklemore">Macklemore</span>. <span word="Since">Since</span> <span word="the">the</span> <span word="early">early</span> 1990<span word="s">s</span>, <span word="researchers">researchers</span> <span word="have">have</span> <span word="shown">shown</span> <span word="that">that</span> <span word="homosexuality">homosexuality</span> <span word="is">is</span> <span word="more">more</span> <span word="common">common</span> <span word="in">in</span> <span word="brothers">brothers</span> <span word="and">and</span> <span word="relatives">relatives</span> <span word="on">on</span> <span word="the">the</span> <span word="same">same</span> <span word="maternal">maternal</span> <span word="line">line</span>, <span word="and">and</span> <span word="a">a</span> <span word="genetic">genetic</span> <span word="factor">factor</span> <span word="is">is</span> <span word="taken">taken</span> <span word="to">to</span> <span word="be">be</span> <span word="the">the</span> <span word="cause">cause</span>. <span word="Also">Also</span> <span word="relevant">relevant</span> - <span word="although">although</span> <span word="in">in</span> <span word="no">no</span> <span word="way">way</span> <span word="proof">proof</span> - <span word="is">is</span> <span word="research">research</span> <span word="identifying">identifying</span> <span word="physical">physical</span> <span word="differences">differences</span> <span word="in">in</span> <span word="the">the</span> <span word="brains">brains</span> <span word="of">of</span> <span word="adult">adult</span> <span word="straight">straight</span> <span word="and">and</span> <span word="gay">gay</span> <span word="people">people</span>, <span word="and">and</span> <span word="a">a</span> <span word="dizzying">dizzying</span> <span word="array">array</span> <span word="of">of</span> <span word="homosexual">homosexual</span> <span word="behaviour">behaviour</span> <span word="in">in</span> <span word="animals">animals</span>.</p><p><span word="But">But</span> <span word="since">since</span> <span word="gay">gay</span> <span word="and">and</span> <span word="lesbian">lesbian</span> <span word="people">people</span> <span word="have">have</span> <span word="fewer">fewer</span> <span word="children">children</span> <span word="than">than</span> <span word="straight">straight</span> <span word="people">people</span>, <span word="a">a</span> <span word="problem">problem</span> <span word="arises">arises</span>.</p><p>"<span word="This">This</span> <span word="is">is</span> <span word="a">a</span> <span word="paradox">paradox</span> <span word="from">from</span> <span word="an">an</span> <span word="evolutionary">evolutionary</span> <span word="perspective">perspective</span>," <span word="says">says</span> <span word="Paul">Paul</span> <span word="Vasey">Vasey</span> <span word="from">from</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Lethbridge">Lethbridge</span> <span word="in">in</span> <span word="Canada">Canada</span>. "<span word="How">How</span> <span word="can">can</span> <span word="a">a</span> <span word="trait">trait</span> <span word="like">like</span> <span word="male">male</span> <span word="homosexuality">homosexuality</span>, <span word="which">which</span> <span word="has">has</span> <span word="a">a</span> <span word="genetic">genetic</span> <span word="component">component</span>, <span word="persist">persist</span> <span word="over">over</span> <span word="evolutionary">evolutionary</span> <span word="time">time</span> <span word="if">if</span> <span word="the">the</span> <span word="individuals">individuals</span> <span word="that">that</span> <span word="carry">carry</span> <span word="the">the</span> <span word="genes">genes</span> <span word="associated">associated</span> <span word="with">with</span> <span word="that">that</span> <span word="trait">trait</span> <span word="are">are</span> <span word="not">not</span> <span word="reproducing">reproducing</span>?"</p>
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