If I were a female, any female, I would want to protect my precious eggs.
I would want to hide them in a hole and I would want that hole to be in a place hard to reach.
Unless I want you to reach me.
All trying to get as close as possible to my eggs.
But I would have a tunnel.
And it would be a labyrinth.
It would be intricate.
It would be unique.
It would be species specific.
So that I am not screwed by a bear.
Each one unique to their respective vaginas.
A cosy fit.
Like a hand in a glove.