Sperm counts worldwide are plummeting faster than we thought
Could be related:„Prenatal Exposure to Progesterone Affects Sexual Orientation in Humans“https://link.springer.com/article/10.1007/s10508-016-0923-zProgesterone can be given if the pregnant woman is older. So maybe the attemp to safe this risky pregnancies of older women by artificial hormones as side effects causes lower fertility of the offsprings. Nature is smart.