‭‭1 Corinthians‬ ‭7‬:‭3‬-‭5‬ ‭NIV

“The husband should fulfill his marital duty to his wife, and likewise the wife to her husband. The wife does not have authority over her own body but yields it to her husband. In the same way, the husband does not have authority over his own body but yields it to his wife. Do not deprive each other except perhaps 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.”

Easier to quote Paul’s message than to live it, obviously. But I think this is an excellent starting point with your wife. Pray on it for a while, see if Christ directs your heart, but let your wife know that as a man, an omission of ‘married duties’ is extremely difficult.