I hear what she saying and all, but I think this advice goes for both men and women.
Just like a lot of women get lazy once they enter a relationship/get married, there are equally the same amount of men that stop slanging the pipe right, stop taking us out on dates, stop buying gifts, gain weight, get those big "8 months pregnant" type of beer bellies, go from Ralph Lauren boxer briefs, to hole in the draws-tighty whities, etc.
Either way, men and women need to give their all from the beginning to end.