God created plants that reproduce after their kind.
Genesis 1:11 Then God said, "Let the land produce vegetation: seed-bearing plants and trees on the land that bear fruit with seed in it, according to their various kinds." And it was so.
God created fish and birds that reproduce after their kinds.
Genesis 1:21 So God created the great creatures of the sea and every living thing with which the water teems and that moves about in it, according to their kinds, and every winged bird according to its kind. And God saw that it was good.
God created animals that reproduce after their kind.
Genesis 1:24 And God said, “Let the land produce living creatures according to their kinds: the livestock, the creatures that move along the ground, and the wild animals, each according to its kind.” And it was so
God created women for man as a helper.
Genesis 2:18 The LORD God said, "It is not good for the man to be alone. I will make a helper suitable for him."
Both the man and the woman had the same name. It was Mr. and Mrs. Adam.
Genesis 5:2 He created them male and female, and blessed them, and called their name "Adam," in the day when they were created.
The act of sex is where a man and woman become one flesh.
Ephesians 5:31 For this reason a man will leave his father and mother and be united to his wife, and the two will become one flesh.
This is the first act of sex in the Bible.
Genesis 4:1 Adam made love to his wife Eve, and she became pregnant and gave birth to Cain. She said, “With the help of the Lord I have brought forth a man.”
When you have sex, you are getting married.
Ruth 4:13 So Boaz took Ruth and she became his wife. When he made love to her, the Lord enabled her to conceive, and she gave birth to a son.
Having sex outside of marriage is called adultery which is a sin.
Exodus 20:14 Thou shalt not commit adultery.
Looking at a woman lustfully is also a sin.
Matthew 5:28 But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart.
Always treat your wife with grace and understanding.
1 Peter 3:7 Husbands, in the same way be considerate as you live with your wives, and treat them with respect as the weaker partner and as heirs with you of the gracious gift of life, so that nothing will hinder your prayers.
Always love your wife with a sacrificial love.
Ephesians 5:25 Husbands, love your wives, just as Christ loved the church and gave himself up for her