There is a manner where true friends behave with each other. As with the Unacceptable Behavior, I find myself having to define what is expected. Unlike Terms of Services, the acceptable behavior policy applies to those without a business relationship. This policy is more tailored to those that would be corresponding, or as friendships. This is pretty much how I treat others, and therefore expect to be treated in return. If it becomes the case that you are not really acting as a true friend, do not expect me to go out of my way on your behalf.
I expect all of my friends to be honest with me. I am sure that there is little chance I may know every lie you commit, but I have been pretty insightful, and tend to catch people. I have also had people who would play games with me, and therefore tend to take the expectation of honesty very seriously.
The integrity(T) of a person is also important. To be otherwise in my opinion is hypocritical. Also, sincerity is very important. While you may not be able to tell everything, it is good to not always beat around the bush so to say. Being trusting, and trustworthy is also important. Trust is the basis of any personal relationship, and while I do not expect you to trust me with your life, I do like to think there could be some provided, and I could earn more as time comes.
It is also important to be respectful. Everyone has different views in regards to everything. I would never try to force you to believe as I do, and would expect the same from you.
A good moral character is always good to have. I do not expect you to live on a grounds of saint-hood, nor do I expect you to be religious. I have come across Atheists, and Agnostics that have better moral character than many people I know that claim to be good religious people. However, I am usually not interested in people that tend to steal just to steal, seek to harm or degrade people, or seek to destroy themselves. I am not going to judge you in issues of religious consequences, but there is a difference between religion and morality.