Coitus-induced ovulation and sex ratio in man.
It is hypothesised that the occurence of coitus-induced ovulation could be an important factor affecting the sex ratio in human progeny. The slight preponderance of males in human sex ratio at birth, 106 : 100, could be influenced considerably by the coitus-induced occurence.
D000818:Animals; D003075:Coitus; D005260:Female; D006801:Humans; D007315:Insemination, Artificial; D008297:Male; D008598:Menstruation; D010060:Ovulation; D011247:Pregnancy; D012744:Sex Ratio; D013997:Time Factors; D014857:Warfare