You can also add declining sperm quality and sperm count. No idea if they both have the same root cause.. First thing coming to mind is stress and bla bla. But i dont think it's the real cause. My gut says plastic..
We have a problem with our tap water whereas estrone, estradiol, estriol, and ethinylestradiol are forever chemicals that are not removed from the water. Hormone replacement therapy and contraceptives are >90% of the source of these.
If you don't filter the water you drink you are experiencing low grade intake of estrogens. This is what water filters are meant to remove and they do. Hence why we have such a huge 'water filter' industry.
The problem with BPA is that BPA is a xenoestrogen, exhibiting estrogen-mimicking, hormone-like properties.[6] Although the effect is very weak, the pervasiveness of BPA-containing materials raises concerns.
If you microwave plastic container holding food. You almost certainly have put a xenoestrogen into your food. Sure we have sort of banned BPA from baby bottles but we haven't done anything to the average person.
Soybeans, Flaxseeds, lentils, etc. All pretty high in isoflavones. Which act like estrogens. Many studies have proven that eating soy or similar foods while in menopause gives benefits in reducing problems. Because of 'conflicting studies' and therefore there's no conclusions and we just keep going forward.
When you put all of these sources of estrogen together. You are absolutely producing a hormone replacement therapy on tons of people.
A sedentary lifestyle leads to a reduction of testosterone. Simple as that.