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 and how these genetic factors are phenotypically expressed to simultaneously induce homosexuality in men and increased fecundity in their mothers and maternal aunts.

Aims: The aim of the present study was to investigate the phenotypic expression of genetic factors that could explain increased fecundity in the putative female carriers.