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The Bible says that "sex" is only for marriage and it unifies the marriage. Its also says that the wife and husband should never deny themselves to each other. But you should not take my word for it....
Read Genesis chapter one! Sex was intended for a man and woman as one to carry out God's will. A man shall leave his father and mother and they shall be one flesh= marriage Genesis 2:24 Be fruitful...
Note:fornication means sex outside of marriage. Rom:1:29: Being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity;...