You see unmarried men are not as worried about their status as women for as the saying goes men are never worried until they get married and women are always worried until they get married. So a lot of unmarried are not bound to do something about their condition because they are not very compelled and I might also add time favours them as their is no biological ticking. And you rightly put it a lot of women stay unmarried because of not being able to lower their standards, but look at them tumbling when the desperation of time and longings or yearning of kids catch up, forget about standards they make terrible mistakes cause they can't think straight anymore.