This is a very interesting but dangerous post: It's interesting because obviously the author has put a lot of thought into the topic and has done some research. However, for me, it clearly shows the danger of ideology, in fact it's a great example of it. "To be ideological is to preconceive reality." and we have a good example of that here: The author has strong opinions about sexuality and our approaches to it, there's nothing wrong with this, it's a prior. But then he starts using bits of "proofs", examples from music and literature, and the tipping experiment to bolster these claims.

Take the claim "The meme of sleeping with our waitress is important to Americans." This may or may not be true (why Americans are singled out is an interesting questions). He then cites a song, a sex and the City episode and a bartender's essay to back this up.

The later part of the post is devoted to an analysis of how our monogamous human sexuality evolved, based on text lifted off from a single book. And towards the end he switches to the notion of the waitress as a "sexual worker".

Now for the interesting part. Although his non-tipping restaurant experiment did NOT provide any proof for his theory he still views it as if it did on hypothetical grounds.

For a much better treatment of some of these ideas, consider: http://www.slate.com/articles/health_and_science/human_evolu...