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Prenatal exposure to a synthetic estrogen like DES (diethylstilbestrol) has caused female brains to be masculinized undifferentiated O feminized O unilateral Question 61 0.11 pts Prenatal exposure to stress, alcohol, and/or drugs increases the chance that mammalian males will be non-heterosexual. These research results provide evidence for sexual orientation being related to womb. personality birthright Olife experiences (nurture) nature (genetics)