Tolstoy, though he was a very bad heretic, was brilliant in his depiction of courtship.
The father of Prince Bolkonsky knew the trick to prevent his marriage to the lesser born Natasha Rostova. Make them wait a year!
Marriage serves the ends of controlling the passages.
That is important, not only for men, but for women as well. Women do need to be restrained with the leverage of the male (that's why God made men bigger and more intelligent, and why a natural society is under male control), or they will allow their passions to go out of control and wreck society, that is what is happening now.
What does a long engagement do but inflame the passions while frustrating them? Excessively long engagements that involve frequent close intimacy between the betrothed are morally unacceptable.