据“中央社”6月14日报道，美国高球名将老虎伍兹(Tiger Woods)显然生来就有超多的运动细胞，但伍兹背着妻子大搞婚外情，是否也是出自天性呢？根据新出炉的研究，搞外遇可能是基因在作怪。
报道引述最新研究报告称，科学家表示，根据基因分析，纵欲的雄性动物往往会生相同癖性的雌性后代，这个论点可能也适用于人类。
德国麦克斯普兰喀研究所鸟类学家佛斯特麦尔，观察上下共5代，超过1500只圈养斑胸草雀，交配及求偶的炫耀行为。
斑胸草雀是一夫一妻制的物种，终其一生都会和元配在一块，不过部分的斑胸草雀有时候会“出轨”。
研究结果显示，基因变异会助长雄性动物的纵欲行为，可能也同样会让雌性动物变得更加花心。
研究报告刊登在《国家科学院院刊》（PNAS）上。（生物谷Bioon.com）
生物谷推荐原文出处：
Proceedings of the National Academy of Sciences DOI： 10.1073/pnas.1103195108
Female extrapair mating behavior can evolve via indirect selection on males
Forstmeier, Wolfgang; Martin, Katrin; Bolund, Elisabeth; Schielzeth, Holger; Kempenaers, Bart
In many species that form socially monogamous pair bonds, a considerable proportion of the offspring is sired by extrapairmales. This observation has remained a puzzle for evolutionary biologists: although mating outside the pair bond can obviouslyincrease the offspring production of males, the benefits of such behavior to females are less clear, yet females are knownto actively solicit extrapair copulations. For more than two decades adaptionist explanations have dominated the discussions,yet remain controversial, and genetic constraint arguments have been dismissed without much consideration. An intriguing butstill untested hypothesis states that extrapair mating behavior by females may be affected by the same genetic variants (alleles)as extrapair mating behavior by males, such that the female behavior could evolve through indirect selection on the male behavior.Here we show that in the socially monogamous zebra finch, individual differences in extrapair mating behavior have a hereditarycomponent. Intriguingly, this genetic basis is shared between the sexes, as shown by a strong genetic correlation betweenmale and female measurements of extrapair mating behavior. Hence, positive selection on males to sire extrapair young willlead to increased extrapair mating by females as a correlated evolutionary response. This behavior leads to a fundamentallydifferent view of female extrapair mating: it may exist even if females obtain no net benefit from it, simply because thecorresponding alleles were positively selected in the male ancestors.
