If one abstains without the other's consent, it is an act of fraud; but if consent is given, it is not, just as if you took something of mine that I had already given you, I could not call it theft. Theft occurs only if you take something by force, without my consent. This is what many wives do when they refuse their husbands. They commit a sin which outweighs the righteousness of their abstinence. They are responsible for their husband's licentiousness and the broken homes that result. Instead of behaving this way, they should value harmony above everything; nothing is more important.
