No fault divorce is bad, but I would argue its a symptom rather than a cause. The real breakdown in sexual morality began with the invention and introduction of cheap reliable contraceptives in the mid 60’s. If you look at the charts, the numbers of divorces, abortions, teenage pregnancies, and incidence of assorted STD’s all skyrocket from that time on.
You can keep you morality as long as you believe like the liberals do.