Coitus-induced ovulation and its implications for estimates of some reproductive parameters

Acta geneticae medicae et gemellologiae
W H James

Abstract

It is estimated here that, at the time of conception, the mean coital rate of young women who subsequently bear DZ twins is about 6% higher than that of the general population of young married women. This differential seems too small to account wholly for the greater promptness in conceiving DZ twins. Accordingly, it is suggested that coital rate is associated with DZ twinning in two ways. The major link seems to be indirect and mediated by erotic response which causes an increase in gonadotrophin levels and thus in double ovulation. In a minority of cases, frequent coitus may give rise to DZ twins via superfecundation, but it seems that, in human beings, the corpus luteum of one ovum will usually inhibit fertilization of any further ova after a short interval. The evidence presented here, though indirect, seems to suggest that, under particularly erotic conditions, double ovulation is sometimes induced. It seems reasonable to infer that coitus also occasionally provokes or accelerates single ovulations, thus impugning some rhythm methods of contraception. But there seems no very good evidence that rape induces ovulation. Some notes are added on the implications of induced ovulation for estimates of fecundability and of the len...Continue Reading

References

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Jul 1, 1981·Annals of Human Biology·W H James
Oct 1, 1981·Journal of Biosocial Science·W H James
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Nov 1, 1973·Population Studies·W H James
Mar 1, 1978·Population Studies·W H James

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Citations

Jan 1, 1987·Acta geneticae medicae et gemellologiae·J P Rushton
Jan 1, 1992·Acta geneticae medicae et gemellologiae·W H James
Jan 1, 1992·Journal of Biosocial Science·W H James
Jan 1, 1992·Acta geneticae medicae et gemellologiae·R E WenkF A Chiafari
Nov 1, 1987·Psychophysiology·H Stanislaw, F J Rice
Feb 18, 1994·Annals of the New York Academy of Sciences·M Weinstein, M Stark
Jan 1, 1992·Acta geneticae medicae et gemellologiae·G AllenS G Vandenberg
Dec 1, 1987·Journal of Epidemiology and Community Health·B BonnelykkeJ Nielsen
Jan 1, 1993·Acta geneticae medicae et gemellologiae·W H James
Apr 1, 1990·Journal of Biosocial Science·B BønnelykkeJ Nielsen

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