Multiple gay sex

Description:Overview[ edit ] The fraternal birth order effect has been described by one of its proponents as "the most consistent biodemographic correlate of sexual orientation in men". First, homosexual men do tend to have a higher birth order than heterosexual men, and this higher birth order is attributed to homosexual men having greater number of older brothers. The fraternal birth order effect has been confirmed to interact with handedness , [19] [7] as the incidence of homosexuality correlated with an increase in older brothers is seen only in not right-handed males. This is because a person's number of older brothers and number of older sisters tend to be positively correlated. Indeed, two samples from the high fertility Samoan population displayed simultaneous fraternal and 'sororal' birth order effects. However, direct comparison of the magnitudes of these two effects showed that the fraternal birth order effect took precedence in the studies.

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