Question

Researchers have discovered a possible biological basis for sexual orientation that has become known as "the big brother effect," meaning ________________.

Answer 1

as the number of older brothers a man has increases, so do his chances of being gay

Answer 2

There are several factors that could increase a person's chance of adopting different sexual orientations. The big brother effect that was discovered by researchers shows that the higher the number of older brothers a person has, the higher their chances of becoming homosexuals.

• This finding was first made in 1958. Then in 1996, the researchers, Ray Blanchard and Andy Bogaert demonstrated that with the birth of each older brother, the chances of a later-born brother being homosexual increased by 33%.

• Therefore, the higher the number of older brothers a person has, the higher their chances of being homosexuals.

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