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I guess that the last one I read was a couple of years ago. I'd suggest you either use google scholar, or use the websites of the journals themselves - BMJ, Lancet, or New England Journal of Medicine. To get an easy start, I think I'd start with google scholar.

This. I've been reading papers in journals for at least 15 years that say that the introduction of the pill was the start of the calamitous drop in sperm count.