Ok... but were certain bonobos more likely to be non-discriminatory than other bonobos based on genetics?

Yea there's tons of studies talking about bonobos sexuality. I did a google search and nothing about a specific set of genes causing a certain sexual behavior in a segment of the bonobo population.

What you are talking about sounds like general behavior in an entire population. And if that's the case then why aren't all humans pedophiles?

Edit: As a counterpoint this is the first thing I found when searching for 'bonobo' 'gene' 'sexuality'

http://www.dnafiles.org/?q=chimp-chat/day-four