It doesn't have to be about genetics though
From what I've read, I think it's more likely to be due to the hormonal environment in the womb
The predisposition for producing hormones is genetic.
Without our genes, we'd produce none.
For me, it's important because it's a part of the life cycle.
Genetic programming is less about the DNA structure (which
we usually cheat heavily on) and more about what passes on
its genes, and what doesn't. If there's a random selector, based
upon overpopulation, it would be interesting to test its efficacy.
Not that I'm likely to, where I'm working.