The Bible tells us that God created man and women2, and God said that a man will leave his parents and unite with his wife and they will become one3. So, in short – sex is God’s divine idea. As Rainey says – God created a process of intimate communication, of which sex is a significant part.
It is a powerful, emotional, bonding experience designed to strengthen a marriage – much as metal rods reinforce concrete. God designed sex as part of communication in a marriage and as a way to really ‘know’ each other.