This is most likely the single most purposely misrepresented thing in the Bible.
Don't make me get on my soapbox again - though apackof2 seemed to like it the last time I cut loose - lol!
1 Corinthians 7:5
Do not deprive each other except by mutual consent and for a time, so that you may devote yourselves to prayer. Then come together again so that Satan will not tempt you because of your lack of self-control.
Paul is talking to both men and women here although most men would say they don't need this, LOL
The point being that part of marriage is to fulfill each other sexually.
Women who love the Lord and their husbands "submit" so to speak
HOWEVER the Word also saids for men to;
Husbands, love your wives, just as Christ loved the church and gave himself up for her
Ephesians 5:25
Which implies a sensitivity to her feelings, and occasional circumstances
Bottom line, in marriage sex should be a win, win situation for both husband and wife