伴侣怀孕时，男性真的易出轨吗？
<p><span word="A">A</span> <span word="new">new</span> <span word="study">study</span> <span word="found">found</span> <span word="that">that</span> <span word="men">men</span> <span word="show">show</span> <span word="shifts">shifts</span> <span word="in">in</span> <span word="behavior">behavior</span> <span word="from">from</span> <span word="mating">mating</span>-<span word="oriented">oriented</span> <span word="to">to</span> <span word="parent">parent</span>-<span word="oriented">oriented</span> <span word="while">while</span> <span word="their">their</span> <span word="partners">partners</span>’ <span word="pregnancy">pregnancy</span> <span word="develops">develops</span>. <span word="These">These</span> <span word="changes">changes</span> <span word="are">are</span> <span word="determined">determined</span> <span word="by">by</span> <span word="changes">changes</span> <span word="in">in</span> <span word="testosterone">testosterone</span> <span word="levels">levels</span> <span word="across">across</span> <span word="pregnancy">pregnancy</span> <span word="and">and</span> <span word="hormonal">hormonal</span> <span word="linkage">linkage</span> <span word="with">with</span> <span word="their">their</span> <span word="partner">partner</span>。</p><p>一项新的研究发现，在伴侣怀孕时，男性的行为会从交配导向型转变为家长导向型。决定这一转变的是伴侣怀孕期间男性睾丸素水平的变化，以及他们与伴侣之间的荷尔蒙联动。</p><p><span word="It">It</span>’<span word="s">s</span> <span word="almost">almost</span> <span word="hard">hard</span> <span word="to">to</span> <span word="imagine">imagine</span> <span word="that">that</span> <span word="every">every</span> <span word="caring">caring</span> <span word="dad">dad</span> <span word="was">was</span> <span word="once">once</span> <span word="a">a</span> <span word="skirt">skirt</span>-<span word="chasing">chasing</span> <span word="ball">ball</span> <span word="of">of</span> <span word="hormones">hormones</span> — <span word="but">but</span> <span word="it">it</span>’<span word="s">s</span> <span word="true">true</span>. <span word="Somewhere">Somewhere</span> <span word="along">along</span> <span word="their">their</span> <span word="transition">transition</span> <span word="to">to</span> <span word="parenthood">parenthood</span>, <span word="biology">biology</span> <span word="puts">puts</span> <span word="a">a</span> <span word="stop">stop</span> <span word="to">to</span> <span word="men">men</span>’<span word="s">s</span> <span word="carefree">carefree</span> <span word="days">days</span> <span word="of">of</span> <span word="sowing">sowing</span> <span word="wild">wild</span> <span word="oats">oats</span> <span word="and">and</span> <span word="turns">turns</span> <span word="their">their</span> <span word="attention">attention</span> <span word="towards">towards</span> <span word="nurturing">nurturing</span> <span word="children">children</span>. <span word="This">This</span> <span word="is">is</span> <span word="a">a</span> <span word="very">very</span> <span word="solid">solid</span> <span word="strategy">strategy</span> <span word="from">from</span> <span word="an">an</span> <span word="evolutionary">evolutionary</span> <span word="point">point</span> <span word="of">of</span> <span word="view">view</span>, <span word="but">but</span> <span word="we">we</span> <span word="didn">didn</span>’<span word="t">t</span> <span word="know">know</span> <span word="exactly">exactly</span> <span word="how">how</span> <span word="it">it</span> <span word="happened">happened</span>.</p><p>难以想象每个慈爱的爸爸都曾是一团追逐女性的荷尔蒙——但这是真的。在转变为人父的过程中，生物机制使男性结束了逍遥自在、四处播种的日子，并将注意力转到养育孩子上。从进化的角度来看，这是一个非常可靠的战略，但我们并不确切知道它是如何发生的。</p>
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