Coital frequency and twinning
Bønnelykke, B.; Olsen, J.; Nielsen, J.
Journal of Biosocial Science 22(2): 191-196
1990
ISSN/ISBN: 0021-9320 PMID: 2335540 DOI: 10.1017/s0021932000018526Document Number: 368655
In a comparative study to enquire whether parents of twins, especially of dizygotic twins, have a higher frequency of sexual intercourse than parents of singleton infants, data on sociodemographic status, coital frequency and other variables were collected using a postal questionnaire. Parents of all twins born alive in Denmark in 1984 or 1985 were included as cases and a random sample of parents of singleton infants born in the same period were controls. No evidence of any difference in coital frequency was found between parents of twins (neither dizygotic twins nor monozygotic) and parents of singleton infants.