Which of the following is FALSE regarding research on sexual orientation?
a) Some studies show that 50–60% of the identical twins of gay men are also gay.
b) A few studies show that exposure to too many androgens during the prenatal period may somehow help explain homosexuality.
c) Some research supports the notion that too small a hypothalamus may contribute to the understanding of homosexuality among men.
d) Some twin studies show that environment plays a larger role in determining homosexual behavior, since the heritability rates are just under 20% for both male and female twin pairs.
Answer: d
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