This I agree with, as in abstinence (or ascetisim of many kinds) can be a beneficial, spiritual practice for those who willingly and enthusiastically choose it.
I find ethical sexual expression absolutely fuels my creative energy and my focus in other areas, and many people in my circles of connections have experienced the same. Sex is a natural human function with numerous physical, emotional, and mental benefits. The pragmatics of preventing unwanted pregnancy should not be the basis for widespread policies of enforced abstinence. Historically speaking, these are doomed to failure.