Sex before marriage in itself is not the problem and two people with different sex drives in a relationship do need to work it out. The problem (imo) is the reason why people expect no sex before marriage. They expect sex before marriage ussually because they put relationship above sex and thus in doing so they loose their right to ever lower the relationship below it. They loose their right to demand harmony in the bedroom because this wasn't one of their expectations when going into marriage to begin with.
Once again, in my humble opinion
