Another Valentine's Day. Another night spent ordering in sushi for one and mooning over "Downton Abbey" reruns. Smarten up, ladies.

Despite all of the focus on professional advancement, for most of you the cornerstone of your future happiness will be the man you marry. But chances are that you haven't been investing nearly as much energy in planning for your personal happiness as you are planning for your next promotion at work. What are you waiting for? You're not getting any younger, but the competition for the...