A man should avoid premarital sex principally to avoid injustice to women.
. . .
“Consent” is the standard defense of the modern seducer, but it’s inadequate. What did she consent to? He can’t assume it was just sex, full stop. Women are instinctively forward-looking. She probably wanted more, even if she didn’t articulate it. Her instincts will want more even if she did not consciously want it at the time. It’s not fair to expect her to have kept track of all his words and to ask no more of him than he explicitly promised. To do so is to insist that pillow talk be treated as seriously as the language of lawyers negotiating a contract. A just man must recognize that lovers’ talk is a kind of verbal foreplay, a sublimation of sexual desire, often beautiful and well worth enjoying, but not capable of dissolving duties founded on the more permanent and objective facts of sexual instinct. The only ethically safe course is either to marry a woman or else to leave her chastity intact.