Left untreated, this condition can go on for decades.
It's because they've been going at it the wrong way. For most of their lives, smart people inhabit a seemingly-meritocratic universe: If they work hard, they get good results (or, in the case of really smart folks, even if they don't work hard, they still get good results).
Good results mean kudos, strokes, positive reinforcement, respect from peers, love from parents.
Or never bothered to cultivate your sensuality as a woman. Attracting a partner is all about the dance of polarity.
Energy flows between positive and negative electrodes, anode and cathode, magnetic north and south.
To put it plainly, you are programmed to reproduce. Let's say by "smart" we mean "in the top 5 percent of the population in terms of intelligence and education." Generally speaking, smart people seek out other smart people to hang out with, simply because they get bored otherwise.