In recent years, widespread concern has arisen that diethylstilbestrol (DES), an estrogen-like synthetic agent that was prescribed between the late 1940s and early 1970s in the USA to prevent pregnancy complications, might induce infertility among these women's children.
On n'a pas non plus abouti à une conclusion concernant la théorie selon laquelle les numérations des spermatozoïdes sont de plus en plus faibles à travers le monde.