"The husband should give to his wife her conjugal rights, and likewise the wife to her husband. For the wife does not rule over her own body, but the husband does; likewise the husband does not rule over his own body, but the wife does. Do not refuse one another except perhaps by agreement for a season, that you may devote yourselves to prayer; but then come together again, lest Satan tempt you through lack of self-control."
I'm no scholar, but that seems pretty clear. The passage about each not ruling over their own body tweaks my hackles a bit, but the fascinating thing to me about this is that it goes both ways, from a gender perspective; husband owes wife, wife owes husband, no favoritism.
"Show me a completely smooth operation and I'll show you someone who's covering mistakes. Real boats rock." -- Frank Herbert