Analysis of the Effect of Hormones on Opposite.. Sex Twin Attitudes

Abstract. Numerous reportS in the literature suggest that hormones may transfer from one fetus to another. in humans as in animals. In a large sample of over seven thousand Australian adult rwins. it was found that opposite-se."C females showed a statistically sig-nificant tendency to hold more masculine attitudes than did same-se."C female twins. This may be due to post-natal social interaction, but could also be caused by the rransfer of testosterone from the male to the female fetus in opposite-sex twins