And nipples, eh?
It’s pretty simple. Because they started out as females. If the fetus has a Y chromosome, it reaches a point in its development where it begins to develop male parts. But before that, all the female parts were present.
Males started out as females. Only under the influence of testosterone did they degrade from the perfect female form into the imperfect male form, with a male brain hamstrung by testosterone levels that keep him a slave to his gender at all times.
But it takes all kinds. We know that, and we will work with it. .