The main issue is that there are more sisters generally than brothers. This means that brothers have greater choices than sisters. I have observed that attractive young sisters will often be quick to find a husband whereas plain spiritual sisters seem doomed to spinsterhood.
It is natural for men to take advantage of this in balance. Because of the way the organisation is structured women have no status and only gain any position through the efforts of their husbands. This means that an attractive young woman may be prepared to settle for someone who they would under normal circumstances reject as not their type because there is fear that if they don't marry quickly they may never get another offer. This has led to a number of mismatched marriages and divorce within the congregation.