Marriable taking the desperate out of dating
 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.
You see when we have the need for food, we can meet this need on our own, by going into the kitchen and making a sandwich.
Now verse 3 the word shall, means must, fulfill or bring to completion the marital/ sexual desires of his/her partner.
This is the ultimate form of selfless love for our partner.
A spouse should ask there partner regularly, are your sexual needs satisfied? In verse 4 it says the wife doesn't have authority over her own body, but her husband does, and likewise the husband doesn't have authority over his own body but his wife does.
You see marriage is the joining of 2 people and God. In marriage God sovereignly removes the authority (to have rights over, or have exclusive claim to) over your own body and gives it as a heavenly wedding present to your spouse.
I am first going to paste "1 Corinthians 7:1-5 (NIV) Now for the matters you wrote about: “It is good for a man not to (marry)have sexual relations with a woman.”  But since sexual immorality is occurring, each man should have sexual relations with his own wife, and each woman with her own husband.
 The husband should (must) fulfill (to perform as Duty, satisfy, fill or meet a need or want) his marital (sexual) duty (moral or legal responsibility or obligation that arises from ones position) to his wife, and likewise the wife to her husband.
Verse 5 says if you are to separate it must be done by mutual agreement.
Because you no longer have complete authority over your own body through the marriage covenant.
This removes sex from the reward and punishment realm.
So sex is not to be witheld as a punishment or bestowed as a reward.
 How do you know, wife, whether you will save your husband?