Yeah that initial video posted seems pretty authentic unlike some staged ones. I would definitely do it, as I believe, as others mentioned, it would be a good male bonding exercise. I'm sure some of you have seen the video of wrestling at Burning Man. It is great as well. I think I would be more into the sparring and playful kind, but with the right connection, I would be open to a more competitive match.
Someone mentioned that they would be more interested in the playful aspect of it when it is clearly done in a playful manner, such as a father and son, and I do think that is a great way for boys to bond with the dads (either nude or clothed). I did it some with my own dad, and I now have a nephew that definitely enjoy this. I am in NO WAY misogynistic, but I definitely think males have genes and hormones that make them enjoy and seek out this kind of thing as a way to express their maleness, and I see nothing wrong with that.