Human sperm is going to be as scarce as hen’s teeth in the future. (I just thought about this and realised that hens don’t have teeth.)
https://www.dailymail.co.uk/health/article-6249825/The-male-fertility-crisis-continues-Quality-sperm-plummets.html
“Sperm count is plummeting - meaning an increasing number of men may need IVF if they hope to conceive, new research shows. Researchers in the US and Spain analyzed semen samples from two major fertility centers between 2002 and 2017. The number of men in their cohort went up seven-fold, from 8,000 to 60,000 in that time, with an increasing number diagnosed with oligospermia, a type of male infertility. What's more, among those men with fertility issues, an increasing number have a sperm count so low they have a higher risk of needing IVF to conceive, while the number of men with a 'normal' sperm count dropped. Lead researchers Dr Ashley Tiegs, who is presenting the findings at a reproductive medicine conference on Monday, told DailyMail.com the drop in sperm quality is possibly driven by environmental factors like smoking, stress, obesity, and exposures to chemicals in plastics.
