When I was in my early twenties and had a friend for a while, we used to lock arms when we went shopping together and snuggle on the couch when we watched a movie together. My late husband thought it was cute. He was such a perv. Thats why i loved him so. ;))
It depends on the situation. If condoling someone, there is nothing wrong showing affection to sympathize. Sorry, if my answer is not among those stated in the question.