What is the purpose of sex in marriage? What was God’s design? I want to suggest three reasons clearly revealed in Scripture.
First, and most obvious is procreation or reproduction. It was God’s design to provide a safe haven in which to rear children.
A second purpose is companionship. Sex is designed to be a bonding experience. The biblical term is: The two become ‘one flesh’. It is deep deep companionship. I believe that is why it is reserved for marriage. It is our unique expression that we are ‘one’.
A third purpose for sex in marriage is for pleasure. If you doubt this, read The Song of Solomon in the Bible. God’s design was mutual sexual pleasure.