I frequently do this with friends, whether offline or online. In my case though, it was instilled in me that it was okay by my 'big sister' who remained my friend even after I was too old for the big sister/big brother program. She always did it with me, and now I do it with a lot of my buddies. But, there's another reason in my case: friends are family to me, and you shouldn't hide your love from your family!