Always Busy
One of the reasons why they don’t do a lot of PDA is because, in most public appearances, they are technically at work. This means that it wouldn’t be appropriate, considering the people who are around them, as well as the fact that they simply don’t have time to enjoy themselves while in public. Lastly, as their work involves meeting and shaking hands with a lot of people, being affectionate while they are out in public isn’t easy to manage.