1. A courtship ritual or grooming pattern is classified to be cultural based on a few factors. A) it has to be something that is context specific (i.e., chimp x and chimp y are good friends and they always clasp hands in a certain way that they would never do with chimp z). B) it is a behaviour that is not universal and/or is diffused in a way one would expect if it was socially learned and passed down from generation to generation. C) It is something that is not ecologically determined (i.e., the behaviour can be explained away based on whether or not there is a certain ecological feature that is absent at another site).

If I might seek clarification: so basically if you see some chimps holding hands, but not all chimps hold hands, and there's no factor suggesting that they should, it's a "traditional" sort of thing? i.e. they might in some fashion "love" for more than just the sake of reproduction?

I'll check out that link tonight, and stay on the lookout for your crow article. I really appreciate you taking the time to elucidate this stuff.