Interesting study here. Effectively, there's a scientific reason people don't make eye contact. Making eye contact is, in essence, a "task" the brain must complete which distracts it from cognitively deciphering what is being said or done, and then formulating a coherent response. Ergo, the brain's go to move is to focus somewhere else.
This study was clearly done by men who want to have a nerdy reason why they're not paying attention to their wives/girlfriends.