1 Corinthians 7:3-4

"The husband should give to his wife her conjugal rights, and likewise the wife to her husband. For the wife does not have authority over her own body, but the husband does. Likewise the husband does not have authority over his own body, but the wife does. "

In many cultures throughout time, the woman in a marriage relationship was virtually or actually considered property of the man in a kind of slave and owner relationship. The wife was expected to do whatever the husband wanted (cook, entertain, bare children, pick up after the man, etc.). The husband, however, was only responsible to provide financially for the woman, and there his responsibilities ended. Obviously, this is a simplistic representation. But I consider it to show how different the Bible, an ancient text, directs us to live together.

Indeed, "the wife does not have authority over her own body, but the husband does." But neither "does [the husband] have authority over his own body, but the wife does." A married couple belongs to each other. They exist to give God glory, and one of the ways to do this is by living for the other spouse. The specific application given deals with providing sexual fulfillment, but I think that the same principle applies to every aspect of a couple's lives together. In everything that they do, each should remember that (s)he belongs to the other.