Further, if rearing or social factors underlie the fraternal birth order effect, then the amount of time reared with older brothers, either biological or non-biological, should predict sexual orientation because rearing time determines the relative opportunity that older brothers have to affect their younger sibling's postnatal sociosexual development. The ov erall pre v alence of homose xuality in the. Both methods intended to "produce family-size-corrected variables for each of the four original sibling parameters older brothers, older sisters, younger brothers, and younger sisters. Log in No account? Individuals who identified having any same-sex sexual partner i. O Gay New World:
THE likelihood of a man being gay is related to how many older brothers he has, with each sibling increasing his chances, a new study claims.
The More Older Brothers You Have, The More Likely You Are To Be Gay. Now We Might Finally Know Why
Sign up Log out news. Correlative studies suggest that these mechanisms are also at play in humans. Despite this compelling evidence, a mechanism to account for the effect remained elusive. Fraternal Birth Order Effect. Journal of Psyc hiatry,