You can even argue that higher population densities will result in larger concentrations of of endogenous human hormones in the environment. During pregnancy, women discharge large quantities of estrogens and progestins in their urine. The progesterone is a known androgen blocker.
Androgen blockers can result in inhibition of genital formation in male fetuses. Animal experiments have also shown, androgen blockers can prevent the masculization of the brain in male fetuses.
How ‘bout 50 million women on hormonal patches, implants, and oc’s peeing into the wastewater management system every day?