I've wondered about the role of genetics myself, though from a different perspective.
I work with children ages 4-12, and after working with teens, I find this age group to be my niche. All through elementary school, I volunteered to be a tutor to younger kids. Service to others seems to be in my blood (there are several teachers, a social worker, and a minister within just a few steps of me in my family tree).
Now, I don't have the desire to have sex with any of the kids I work with. But I feel like my desire to work with that age group comes from outside of me. It is a calling for me. And being an avid Star Wars fan, I wonder if this "calling" to work with kids is just like the Force: either you have it, or you don't, and you can have it in small proportions, or large proportions.
I happen to use my calling for the "Light Side," to help kids to grow, and become better human beings. But obviously, there are those that see someone smaller than themselves as objects to please themselves. And the serial abusers do seem to have a very real rapport that helps them to groom their victims. They, obviously, are on the "Dark Side."
In my family, service to others is probably a learned trait (modeled since birth, and developed into my core values), however that service can go in many different directions, and my calling is toward kids, my uncle's calling is toward the ministry. Maybe it's more spiritual than genetic. Or maybe it's a recessive gene...
Food for thought. Eat up!
We're in this together.
We're in this together. - Nine Inch Nails