I've been reading The Forever War by Joe Haldeman. And assuming that Earth is super overpopulated eventually (moreso that now), sterilazation, DNA altering, and other radical changes in mankind such as homogenous relationships worldwide may be one of the few ways mankind can persist in he universe ...
It's a good book. I recommend it. I guess my point is that sometimes when something is different Now, it's hard to grasp it's significance and pros and cons because maybe our viewpoint is skewed to our current perceptions (which is a theme throughout the book, it has alot of time travel).
https://en.wikipedia.org/wiki/5α-Reductase_deficiency#Fertil...