I'm having a hard time understanding the focus on rape in this thread. Why is it getting more airtime than murder, or theft, or destruction of property, or slavery, or any of a multitude of other abuses of man against man?
The humanist understands that he has the same rights -- and no more! -- that he is willing to allow everyone else. The humanist understands that he has the same obligations -- and no more! -- that she is willing to demand of everyone else.
Now, if you see yourself, and your children, and the people you care about, deserving and enjoying being raped, or murdered, or stolen from, or despised, or disfellowshipped, excommunicated and what-have-you, then perhaps you might have a case to make for why any of those things might enjoy some sort of ethical validation. If you would distinctly NOT like those things happening to you, you now have a bullet-proof argument for why it would unethical for you to inflict them on others.
I do not need "God" or "10 Commandments" to figure that out.