Our bodies are always making and excreting hormones. It’s difficult for me to believe that the wastewater from a city would be very different if no one used hormonal contraception.
During pregnancy progesterone levels rise 100-fold, estrogen even more.
There’s a huge difference between natural human reproductive hormones and the synthetic versions of hormones found in the birth control pill. The latter are orders of magnitude stronger in clinical effect per mg dose, and unlike the natural human version, they do not break down in the waste water purification system. They do indeed wind up in the waters downstream from sewage treatment effluent, and they do indeed change the sexual makeup of the fish.
More frighteningly, most human drinking water sources are also downstream from sewage treatment effluent of populations upstream. If its doing this to fish, what is it doing to humans?!?
Never waste a good opportunity to fleece and rob the working stiffs.