I tend to be a meet in the middle kind of person, attempt to understand where they are coming from and their needs, and attempt to articulate mine in a way they can understand, so we can use that understanding to find a middle ground that is good for the both of us...
Edit: ah, changed the question a bit, uh, as far as initiating relationships (romantic), I usually don't, I often try to initiate friendships, which is often misinterpreted as trying to initiate a romantic relationship... But if some one is quite obvious about their interest in me, and I happen to feel a romantic relationship with them has a decent chance of working out, or at least not endangering our friendship if it doesn't, then I am willing to meet in the middle, occasionally even going a bit further into being the aggressor...