It will not do to say, “As long as people are honest with one another, fornication is all right.” The point is that they cannot be honest with one another in that situation. The supposed honesty of detachment, or deferral, or temporizing, or mutual hedonism, only embroils them in a deeper lie. The body in the act of generation says, whether we like it or not, “I am reaching out to the future, to a time when there will be no turning back.” The body, naked to behold in love, says, “There is nothing of mine that I do not offer as yours. We complete one another, man and woman.” Such affirmations transcend the division between the private and the public. They are therefore only made in honesty by people who are married””who have acknowledged publicly that they belong forever to one another and to the children they may conceive by the marital act.
No one but a sadist could say, “I feel no love for you, but am using your body as a convenient receptacle, for the sake of the pleasure. Afterwards I dearly hope you will not trouble me with your continued presence.” Is that too strong? What about this? “I like you very much, and yet I have no intention of spending the rest of my life with you, or even the rest of this year.”
Read it all.