What is courting according to the Catholic interpretation of the Natural Law?

The Natural Moral Law is a good way for Christians to understand quite a bit about the nature and purpose of what they're doing and who they are and quite a few of the papal teachings in the last hundred years have been around the nature and purpose of marriage and the relations between the sexes (Castii Canubii, Arcanum divinae sapientiae, Humane Vitae, etc.) , but to my knowledge very few have ventured to give advice about how to get there. What can the Natural Moral Law, which instructs us that marriage is a bond centered around unity and procreation, tell us about how we should conduct ourselves while courting? What should one's expectations be of a suitor and suttee?