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New Evidence of Genetic Factors Influencing Sexual Orientation in Men: Female Fecundity Increase in the Maternal Line
There is a long-standing debate on the role of genetic factors influencing homosexuality because the presence of these factors contradicts the Darwinian prediction according to which naturalExpand
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Sexually Antagonistic Selection in Human Male Homosexuality
Several lines of evidence indicate the existence of genetic factors influencing male homosexuality and bisexuality. In spite of its relatively low frequency, the stable permanence in all humanExpand
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Fecundity of Paternal and Maternal Non-Parental Female Relatives of Homosexual and Heterosexual Men
A variety of social, developmental, biological and genetic factors influence sexual orientation in males. Thus, several hypotheses have attempted to explain the sustenance of genetic factors thatExpand
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Mothers who kill their offspring: testing evolutionary hypothesis in a 110-case Italian sample.
OBJECTIVES This research aimed to identify incidents of mothers in Italy killing their own children and to test an adaptive evolutionary hypothesis to explain their occurrence. METHODS 110 cases ofExpand
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Factors associated with higher fecundity in female maternal relatives of homosexual men.
INTRODUCTION Recent evidence suggests that sexually antagonistic genetic factors in the maternal line promote homosexuality in men and fecundity in female relatives. However, it is not clear if andExpand
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Reaching and grasping behavior in Macaca fascicularis: a kinematic study
The prehensile hand is one of the major traits distinguishing primates from other mammal species. All primates, in fact, are able to grasp an object and hold it in part or entirely using a singleExpand
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Societal Norms Rather Than Sexual Orientation Influence Kin Altruism and Avuncularity in Tribal Urak-Lawoi, Italian, and Spanish Adult Males
Homosexual males could balance their low fitness by increasing benefits to relatives either through kin-directed altruism or by avuncularity (altruistic behavior toward the children of siblings).Expand
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Possible Balancing Selection in Human Female Homosexuality
A growing number of researchers suggest that female homosexuality is at least in part influenced by genetic factors. Unlike for male homosexuality, few familial studies have attempted to exploreExpand
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Interpopulation differences in activity patterns ofMacaca sylvanus in the Moroccan Middle Atlas
We studiedMacaca sylvanus populations from a) a protected, relatively undamaged climax Cedar forest and b) a degraded, mixed Cedar-Oak forest. Animals exhibit considerable differences in demographic,Expand
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Implicit measurements of sexual preference in self-declared heterosexual men: a pilot study on the rate of androphilia in Italy.
INTRODUCTION An unambiguous measurement of the rate of nonheterosexuality in the male population (male bisexuality and homosexuality) is essential to estimate the health risks associated withExpand
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