What is the epitome of an intimate relationship?

Is it sharing everything and anything? Is it being the best of friends? Is it loving a person unconditionally? Is it taking the boundaries of a normal relationship and stretching them to the breaking point? Is it thinking outside the box? Is it about the ultimate compatability? Is it never getting tired of a person? Is it about spending time and not thinking about the circumstances? Is it about individual preferences and not others' opinions? Who knows... When I figure all this out maybe I will elaborate more.