God created male and female and blessed them

 “So God created man in his own image, in the image of God he created him; male and female he created them. And God blessed them. And God said to them, 'Be fruitful and multiply and fill the earth and subdue it and have dominion over the fish of the sea and over the birds of the heavens and over every living thing that moves on the earth.'” (Gen. 1:27-28 NIV)

Two become one flesh

“Then the LORD God made a woman from the rib he had taken out of the man, and he brought her to the man. The man said, “This is now bone of my bones and flesh of my flesh; she shall be called ‘woman,’ for she was taken out of man.” That is why a man leaves his father and mother and is united to his wife, and they become one flesh.” (Gen. 2:22-24 NIV)

Your body belongs to your spouse

“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.” (1 Cor. 7:4 NIV)

He who loves his wife loves himself

“Husbands, love your wives, just as Christ loved the church and gave himself up for her to make her holy, cleansing her by the washing with water through the word, and to present her to himself as a radiant church, without stain or wrinkle or any other blemish, but holy and blameless. In this same way, husbands ought to love their wives as their own bodies. He who loves his wife loves himself.” (Eph. 5:25-28 NIV)

Wives submit and husbands love

“Wives, submit yourselves to your husbands, as is fitting in the Lord. Husbands, love your wives and do not be harsh with them.” (Col. 3:18-19 NIV)

Two are better than one

“Two are better than one, because they have a good return for their labor: If either of them falls down, one can help the other up. But pity anyone who falls and has no one to help them up. Also, if two lie down together, they will keep warm. But how can one keep warm alone?" (Eccles. 4:9