Because male fetuses are more fragile than female fetuses, they are more likely to be damaged.

There is only a little difference between a man & a woman,but that little difference makes a very big difference.

You are not male or female, but a plan
deep-set within the heart of man.

This has to be replicated elsewhere. We'll see what the results of those studies are.

Statistically, it is clearly true; compared to men, (women) are biological fortresses.

Then He made of him two kinds, the male and the female.