[steadfastconservative]

Yes, but this passage does not mean that each spouse is bound, under the penalty of mortal sin, to agree to every request of the other to have relations. That would be ridiculous. And it is not what the Church teaches.

[mockingbyrd]

You’re right. The Church teaches that the spouses are no longer two but one. And therefore cannot with hold themselves for selfish reasons. There are plenty of legitimate reasons to tell your spouse, “not tonight.” But anger, bitterness or punishment aren’t justifiable reasons. Of course, in a healthy sacramental reasons, neither spouse is going to insist upon their marital rights if the other isn’t up for it. It’s simply a reminder that we are to love fully and unselfishly. Withholding sex and demanding it are both selfish acts.