To try to avoid respondents saying what they thought the interviewer wanted to hear rather than the truth, the questions on sexual identity and sex with same-sex partners were asked through an Audio Gay and heterosexual men Self-Interview ACASI system in survey waves prior to Personalised recommendations.
Blanchard R Quantitative and theoretical analyses of the relation between older brothers and homosexuality in men. Arch Gay and heterosexual men Psychiatry. Increases in fecundity as an artifact sampling bias of the fraternal birth order effect are possible because randomly selected homosexual groups tend to include more older brothers than well-matched heterosexual comparison groups; consequently, homosexual groups exhibit larger sibships .
This finding does not suggest that a fraternal birth order effect does not occur, but rather that the fraternal birth order effect gay and heterosexual men cannot explain the persistence of genetic factors that partially influence homosexuality associated with the low frequency of reduced fecundity in all populations.
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This study did not collect data on male fecundity. Bailey, J. Additional data, particularly data obtained from non-industrialized high fecundity societies, are needed to further gay and heterosexual men that sexually antagonistic selection is a widespread phenomenon explaining the male homosexuality conundrum.
A question rises whether it is appropriate to test balancing selection hypotheses in low fertility populations, such as Italy and Spain. Gay and heterosexual men Selection and Fraternal Birth Order Effect Camperio Ciani, Corna and Capiluppi  showed that mothers of homosexual men were significantly more fecund than the control-matched mothers of heterosexual men.
Contrary to the predictions of the X-chromosome linkage hypothesis, King et al. Archives of General Psychiatry5885—
Close Search for. The colloquial shortening "hetero" is attested from It has been characterized as "mostly straight". The mastermind behind the entire NPC Daily movement.
We observed that the paternal aunts of heterosexuals were significantly more fecund than their maternal aunts, whereas the opposite was observed for the aunts of homosexuals, whose maternal aunts were more fecund than the paternal aunts, although these results were not significant.
Theoretically, however, the maternal effect cannot account for the conundrum. View Article Google Scholar 5. The data for the pedigree analysis were collected face-to-face, and according to the protocol, the questions were repeatedly cross checked and all efforts were made to precisely ascertain the family members fecundity, including the age of every female in the family of the proband, as previously described .