I've seen many theories about this. The most recent suggests ibuprofen might be a culprit. https://www.cnn.com/2018/01/08/health/ibuprofen-male-fertility-study

I've seen many theories about this. The most recent suggests ibuprofen might be a culprit. https://www.cnn.com/2018/01/08/health/ibuprofen-male-fertility-study/index.html https://www.cnn.com/2018/01/08/health/ibuprofen-male-fertili...