First of all, let me give a disclaimer. I'm a lawyer, not a computer scientist, so to say specifically what was happening, I'm not sure. It could be many things. It could be an example of the sort of thing that Matthew was talking about, that there's an algorithm that's calculating what people who look at these two videos tend to like. It could reflect other users' preferences and be associating things together. It could reflect some less sophisticated algorithm that's searching for a term or a content like underwear, or testicles, or whatever the case may be. It's aggregating like content in that way. Or it could be, although you've told us that it's not, based on your own personal search history.
On December 5th, 2016. See this statement in context.