Logically, whom you don’t hang out with, you don’t befriend or fall in love with, therefore you have no incentive to marry. Therefore, making sure not to hang out with jerks should limit the possibility of marrying a jerk.
With no intent to hurt or offend anyone, I have to say that women, especially young ones, do tend to be attracted to certain qualities in men which are not that good. Think all the mystery aura. The uncertainty. Not knowing what he really thinks, what he will do. Some men even know how to use it consciously and on purpose in order to conquer a woman.
I would say getting over the fascination with uncertainty and learning to appreciate the guy who keeps his word and says his mind could save many women from disasters. I’ve noticed that sometimes women are more at ease with men confessing sexual attraction than a feeling of love. I can’t possibly say where it comes from apart from blaming it on the modern times, but I’m sure it leads to no good, but contrary, to suffering.
Both sexes have the “bad” fascination. Bad guys, bad girls. The sooner one gets over it, the better. Not falling for such behaviour at any stage is probably the best way to avoid falling victim to a jerk in the future. Personally, I don’t take well to jealousy plays, excessive drama, unequal treatment (double standards), recanted promises, punitive behaviour and the like, and I can’t say I’m unhappy with it. This is not to say I try to be unforgiving, but I just want promises kept, feelings not toyed with and some measure of proportion observed. Imperfections are what we love people for, but let’s not be mean…