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The reproductive lifecycle
Variation in reproductive function
Seasonal changes in sexual activity and
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abnormal abortion androgen animals anovular cycles appear biological birth-rate breeding cent century changes chromosome coital coitus conception-rate contraception corpus luteum decline decrease DZ and MZ DZ rate DZ twins effect ejaculation embryo England and Wales especially ethnic variation evidence excess of males factors female tract figures follicular phase frequency function girls human reproduction Hutterite incidence increase individual infertility influence instance intercourse lactation large number length of gestation life-cycle mammals Marie Stopes marriage maternal age menarche menopause menstrual cycle menstruation method mid-cycle milk months multiple births normal occur oestrogen oestrous olfactory orgasm ovaries ovulation parity peak phase population pre-menstrual pre-menstrual tension pre-natal pregnancy produce proportion of males puberty ratio at birth ratio at conception recorded result seasonal variation sex ratio smell social spermatogenesis spermatozoa stage temperature tion total twinning triplets twin births twinning rate uterus variability wastage woman women