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This is pure speculation, but I wonder if endocrine disrupters present in plastics are leading to a decline in testosterone and therefore decline in fertility (I also wonder how those disrupters affect women)

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Not only is that pure speculation, but it replaces a simple sociological explanation (changing gender roles) with a crackpot "scientific" one.

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How is your explanation simple and where is the data to back that? This theory isn’t crackpot, global sperm rates are declining, the average testosterone of men is lower than it was during your grand-fathers time. Certain plastics have been shown to be endocrine disrupters.

Your theory might work in westernized countries but this trend is global according to the article, certain countries enforce more traditional values for men and women and those countries are also seeing a decline.