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Male infertility Some research suggest that increased male age is associated with a decline in semen volume, sperm motility, and sperm morphology. 316 pp Knox,. 50 Historical trends by country edit Main article: Historical demography See also: Demographic transition adult dating in Stamford France edit Main article: Demographics of France The French pronatalist movement from failed to convince French couples they had a patriotic duty to help increase their country's birthrate. Bongaarts' model of components of fertility edit Bongaarts proposed a model where the total fertility rate of a population can be calculated from four proximate determinants and the total fecundity (TF).
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