Men and sex and dating defined
Something I've discovered is that, when you honor a woman, you are honoring yourself. Because someday you will have regret, and the regret will last much longer than the pleasure.
In the movie best interest), you honor yourself and insure that you will have no long-lasting regrets to live with.
And while something inside her is telling her it's the right thing to do, something inside the guy is telling him just the opposite, yet he proceeds. For the physical pleasure no doubt, but also, I think, for another reason: it makes him feel like a man.
But there is a great irony in that, for what is manly about deceiving a woman?
I know a newlywed couple who have sex less than once a month because of this -- he doesn't respect her, she knows it, and she doesn't trust him, so she doesn't want to give herself to him.