During reproductive time,sperms are transferred to urinogenital papilla via vasa efferentia and vasa deferentia,and enter the female reproductive tracts by the way of internal fertilization.
If the high-fertility nations were to see dramatic declines in Total Fertility Rates (TFRs, the number of children per woman during her reproductive life-time) we would need to see drastic cuts in reproductive rates in at least 40% of all nations and that would have to start today.