Cool link, this is what I gathered from it:
Once we get sexual reproduction working well, we need to set up the scripts to allow changes in the environment from time to time.
Seems sex is mainly beneficial if the organism has to adapt further. AFter all, if you're perfectly adapted, there's not much point in mutating or trying to be better.
Or alternatively, we set up different areas of the egrid to use different physical constants, and see if the bots radiate (ie: specialize), and wether or not sexual reproduction does it faster (is there an advantage?).