<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Zietsch, B.</style></author><author><style face="normal" font="default" size="100%">Morley, K.</style></author><author><style face="normal" font="default" size="100%">Shekar, S.</style></author><author><style face="normal" font="default" size="100%">Verweij, K.</style></author><author><style face="normal" font="default" size="100%">Keller, M.</style></author><author><style face="normal" font="default" size="100%">Macgregor, S.</style></author><author><style face="normal" font="default" size="100%">Wright, M.</style></author><author><style face="normal" font="default" size="100%">Bailey, J. M.</style></author><author><style face="normal" font="default" size="100%">Martin, N.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Genetic factors predisposing to homosexuality may increase mating success in heterosexuals</style></title><secondary-title><style face="normal" font="default" size="100%">Evolution and Human Behavior</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Antagonistic pleiotropy</style></keyword><keyword><style  face="normal" font="default" size="100%">Darwinian paradox</style></keyword><keyword><style  face="normal" font="default" size="100%">Environmental</style></keyword><keyword><style  face="normal" font="default" size="100%">Evolution</style></keyword><keyword><style  face="normal" font="default" size="100%">Femininity</style></keyword><keyword><style  face="normal" font="default" size="100%">Gender identity</style></keyword><keyword><style  face="normal" font="default" size="100%">Genetic</style></keyword><keyword><style  face="normal" font="default" size="100%">Heritability</style></keyword><keyword><style  face="normal" font="default" size="100%">Homosexuality</style></keyword><keyword><style  face="normal" font="default" size="100%">Masculinity</style></keyword><keyword><style  face="normal" font="default" size="100%">Mating success</style></keyword><keyword><style  face="normal" font="default" size="100%">Sexual orientation</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2008</style></year><pub-dates><date><style  face="normal" font="default" size="100%">11/2008</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.sciencedirect.com/science/article/pii/S1090513808000688</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">29</style></volume><pages><style face="normal" font="default" size="100%">424-433</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">There is considerable evidence that human sexual orientation is genetically influenced, so it is not known how homosexuality, which tends to lower reproductive success, is maintained in the population at a relatively high frequency. One hypothesis proposes that while genes predisposing to homosexuality reduce homosexuals&#039; reproductive success, they may confer some advantage in heterosexuals who carry them. However, it is not clear what such an advantage may be. To investigate this, we examine a data set where a large community-based twin sample (N=4904) anonymously completed a detailed questionnaire examining sexual behaviors and attitudes. We show that psychologically masculine females and feminine men are (a) more likely to be nonheterosexual but (b), when heterosexual, have more opposite-sex sexual partners. With statistical modelling of the twin data, we show that both these relationships are partly due to pleiotropic genetic influences common to each trait. We also find a trend for heterosexuals with a nonheterosexual twin to have more opposite-sex partners than do heterosexual twin pairs. Taken together, these results suggest that genes predisposing to homosexuality may confer a mating advantage in heterosexuals, which could help explain the evolution and maintenance of homosexuality in the population.</style></abstract><issue><style face="normal" font="default" size="100%">6</style></issue><section><style face="normal" font="default" size="100%">424</style></section></record></records></xml>