Zacs-Mater - //Do you mean expectations, or do you mean obligations?//
An excellent point.
No, there are no friendships without expectations - expectations are the cornerstones of any relationship, but they are so much an integral part, that people rarely even consider them.
Obligations however, are an entirely different matter, and the are many friendships without obligations.
There are some friends you know you can go to when things are going wrong, and others who won't help but are good fun when things are fine. If you know which is which and don't expect too much from the latter, then you're doing ok in your choice of friends.