This seems like a loaded question to me.
If the atheist answers "If it bleeds it breeds" or "If it's a hole I am on a roll", you can sit back and say "Yep I know, those damned atheists will do anything and anybody"
If the atheists answers "Only at night with the lights off with my wife and only for procreation", you can sit back and say "Don't you wonder where you got that morality from?"