As a house can be only be built satisfactorily and durably when there is a foundation, and a picture can be painted only when there is something prepared to paint it on, so carnal love is only legitimate, reasonable, and lasting when it is based on the respect and love of one human being for another.
Anyone who is observant, who discovers the person they have always dreamed of, knows that sexual energy comes into play before sex even takes place. The greatest pleasure isn't sex, but the passion with which it is practiced. When the passion is intense, then sex joins in to complete the dance, but it is never the principal aim.
Someone told me the delightful story of the crusader who put a chastity belt on his wife and gave the key to his best friend for safekeeping, in case of his death. He had ridden only a few miles away when his friend, riding hard, caught up with him, saying 'You gave me the wrong key!