Pretty much what needed to be said has been said. My advice to all: study this topic in great detail, get married and then discuss this issue with your spouse. The unmarried brothers and sisters should think about just getting that one spouse first. Once you do get married you will be in a position to apply the theoretical knowledge.
Those who are married (or have been at least once) have proven my point. For those who are not or have not been married before can be given advice all day long, they can swim in the sea of knowledge but still come out pretty dry. And the last few posts have proven this point.