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To your first point, I think that's true, but we are also attempting to appear faithful, so as not to invoke the wrath of those who demand it from us. So being deceitful is, in fact, to our (evolutionary) advantage.

To your second point, I wouldn't even attempt to derive an ought from any of this. It is what it is. My earlier post was just an attempt to explain why it is that people are so hung up on politicians sex lives. I think it's largely due to our biological double-standard, not because we're simply a prudish culture. Though I'm sure culture plays a role.