According to William Rice and colleagues, the concordance of homosexuality among twins raises the possibility that homosexuality is not caused by genes nor atypical levels of hormones, but an epigenetic mechanism controlling how sensitive fetuses are to prenatal hormones.
According to William Rice and colleagues the concordance of homosexuality among twins raises the possibility that homosexuality is not caused by genes nor atypical levels of hormones but an epigenetic mechanism controlling how sensitive fetuses are to prenatal hormones