 Since humans stopped reproducing among themselves, what has been the greatest impact on human biology?
Everything has evaporated in Maternite. They were created so long ago, indeed, that the ignorant believe them to have been constructed by the gods themselves. Prayers and supplications were offered to the gods, priests were sent to sacrifice, and finally, as the light of the sun was falling between the pillars, the High Priest of the Maternite Machine was heard. Yet perhaps it is for the best, for those left were the most earnest and intelligent. The machines bear the exact number of children each year to balance the number of us whom the gods claim. "But now," he continued, however, with less assurance and indeed with even a stutter here and there, "an unprecedented situation has arisen.
 significant reduction of the appearance and function of sex organs
 significant reduction of the appearance and function of sex organs  more predictable measures for increasing the global population  gradual decrease in the overall intellectual quotient of a society  a lower prevalence of birth defects and learning disabilities