
The concept of marriage & marriage vows are based on Christian religion. Per Christianity:
1 Corinthians 7:5
Do not deprive one another, except perhaps by agreement for a limited time, that you may devote yourselves to prayer; but then come together again, so that Satan may not tempt you because of your lack of self-control.
1 Corinthians 7:3
The husband should give to his wife her conjugal rights, and likewise the wife to her husband.
In answer to the question, "My wife won't have sex with me but once a month--if that! What is 'normal sexual relations'? She makes me out to be a sex maniac. What does the bible say, if anything, about this?" A response by Dean VanDruff.
1Cor 7:5 (NKJ) Do not deprive one another except with consent for a time...
1Cor 7:5 (Wey) Do not refuse one another, unless perhaps it is just for a time and by mutual consent...
"So, it is a sin to refuse sex to your spouse. More to the point are the verses just before":
1Cor 7:3-4 (NRS) 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.
"As to frequency, I suppose people differ. But it is not for an outsider to say in any case.
If one partner wants sex, then God's command for marriage is clear enough: "no refusal" is permitted unless mutually agreed to for a time of prayer. That is the command of scripture. Your body belongs to her, and vice versa."
So outside of physical or mental issues involved to where the wife can't give her man sex on a regular basis in an marriage & as long as you have been a faithful, loving provider as a husband & haven't done something wrong to dishonor or lose a womans trust (infidelity, abuse, etc) the wife is negligent by not doing her Christian duty in pleasing the husband sexually.
Acts 17:11 Dialog: Denial of Sex Within Christian Marriage--a Sin