Besides, promiscuity destroys romance. Mary looked down. You can't promise to have a feeling. Sexual union takes each spouse out of the Self for the sake of the Other. Now pay attention.
Conjugal union is a true merging.
They become a one-flesh unity. And I don't mean just flesh. Mary cut in. In the Christian view, if this is how we function, it's because this is how we were designed to function by God. Now if God designed us to work this way, He must have finished the job.