@Mafia - ''You seem to be misunderstanding the basic idea behind moral relativism. Moral relativism is not the view that all morality has changed at one point or another and that nothing is ever wrong in all cases. It's possible to take the stance that rape is always wrong, and murder is always wrong, and still be a moral relativist. The key point is that for a moral relativist, declaring anything wrong requires a logical argument explaining why it's wrong. Thus a moral relativist can still believe that rape and murder are always wrong, but under certain circumstances theft or physical assault might be justifiable. A moral absolutist cannot take that position. To an absolutist rape is wrong, not because it involves stripping someone of their sovereignty over their own body, but simply because it's a rule that has been laid down by some higher power that rape is wrong.''
I have a lot of sympathy with your views. They do, however, slightly remind me of those (both atheists and literalists) who accuse theists of a more liberal bent of cherry-picking the bits of he Bible they want to follow. As you say that you are a naturalist, however, I think that you must go where naturalism leads. Indeed, Dawkins states that: “We are survival machines – robot vehicles blindly programmed to preserve the selfish molecules known as genes.'' So why might a naturalist take up a moral position on, for example, rape. If anything, in these terms, the rape of females can be viewed as a ''natural'' and successful fitness enhancing strategy. Indeed, if you remember, this attitude of mind caused some problems for Dawkins a few months back:
JB: But when you make a value judgement don't you immediately step yourself outside of this evolutionary process and say the reason this is good is because it's good, and you don't have any way to stand on that statement?
RD: But my value judgement itself could come from my evolutionary past.
JB: So therefore it's just as random in a sense as any product of evolution.
RD: Well, you could say that. But it doesn't in any case - nothing about it makes it more probable that there is anything supernatural.
JB: Okay, but ultimately, your belief that rape is wrong is as arbitrary as the fact that we've evolved five fingers rather than six.
RD: You could say that, yeah.
http://www.anthonysmith.me.uk/2008/11/06/dawkins-on-rape/
Now one thing we must credit Dawkins with is a consistent naturalist position. A position which became clearer when he compared the unease caused to a women by unwelcomed propositioning in a lift to his own caused by a man chewing gum: http://www.newstatesman.com/blogs/david-allen-green/2011/07/richard-dawkins-chewing-gum
So Mafia, in my view, a moral relativist, who holds a naturalist position, cannot make absolutist moral statements that apply at all times and for all societies. It appears Dawkins accepts this, I wonder why you don't?