Femininity and fertility in sisters with twin brothers: prenatal androgenization? Cross-sex socialization?
Are sisters of twin brothers behaviorally or physiologically masculinized? Prenatal exposure to their brothers' androgens and postnatal socialization experiences unique to girls growing up with twin brothers might influence their attitudes, pubertal development, and reproductive histories. To investigate, we studied age- and cohort-matched samples of Finnish sisters from same-sex and opposite-sex twin pairs. Using data from two ongoing longitudinal studies of consecutive birth cohorts of Finnish twins, we assessed pubertal development at ages 11 and 14 and endorsement of attitudes associated with femininity at age 16. We also studied fertility in Finnish women from same- and opposite-sex twin pairs born from 1958 through 1971, obtaining information on their child-bearing histories when they were ages 15 to 28. Results of each comparison were unambiguously negative: There was no evidence of differences between sisters from same- and opposite-sex twin pairs, and thus, no evidence of either androgenization or cross-sex socialization.
Rose
Richard J
RJ
Indiana University, Department of Psychology, Bloomington 47405-7007, USA. rose@indiana.edu
Kaprio
Jaakko
J
Winter
Torsten
T
Dick
Danielle M
DM
Viken
Richard J
RJ
Pulkkinen
Lea
L
Koskenvuo
Markku
M
D000293:Adolescent; D000328:Adult; D002648:Child; D015331:Cohort Studies; D005260:Female; D005298:Fertility / Q000502:physiology*; D005387:Finland; D005783:Gender Identity; D012739:Gonadal Steroid Hormones / Q000235:genetics; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects; D011627:Puberty / Q000502:physiology; D012951:Socialization; D014429:Twins, Dizygotic / Q000235:genetics* / Q000523:psychology*; D014430:Twins, Monozygotic / Q000235:genetics / Q000523:psychology
D012739:Gonadal Steroid Hormones