Rules?

I wish there were a rulebook for intimacy. Some kind of guide to tell you when you've crossed the line. It would be nice if you could see it coming, and I don't know how you fit it on a map. You take it where you can get it, and keep it as long as you can. And as for rules, maybe there are none. Maybe the rules of intimacy are something you have to define for yourself. - Meredith Grey