blog：Bisexuality inherited from ”hyper-heterosexual” female family members
Bisexual men may have inherited their attraction to males through hyper-heterosexual female family members, according to a new research.
Earlier studies have suggested that genes influencing sexual orientation in men also make women more likely to reproduce.
Andrea Camperio Ciani and colleagues at the University of Padua, Italy, showed that the female relatives of homosexual men tend to have more children, suggesting that genes on the X chromosome are responsible.
Now the team has shown that the same is true for bisexuality.
To reach the conclusion, the researchers asked 239 men to fill out questionnaires about their families and their past sexual experiences. On the basis of their answers, the men were classified as heterosexual, bisexual or homosexual.
The results showed that the maternal aunts, grandmothers and mothers of both bisexual men and homosexuals had more children than those of heterosexual men.
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