"Genesis 1:27 says, 'God created man in his own image, in the image of God he created him; male and femlae he created them.' Sometimes we make the mistake of thinking God created us this ay, and then later when Christ came to do his saving work, God looked around and said, 'Well, that's a good analogy, man and woman. I'll describe My Son's salvation with that. I'll say it's like a husband dying to save his bride.'
"It didn't happen like that. God did not look around and find manhood and womanhood to be a helpful comparison to His Son's relation to the church. He created us as male and female precisely so that we could display the glofy of His Son. Our sexuality is designed for the glory of the Son of God - especially the glory of His dying to have His admiring bride.
"In Ephesians 5:31, Paul quotes Genesis 2:24, 'Therefore a man shall leave his father and mother and hold fast to his wife, and the two shall become one flesh.' And then he adds this, 'This mystery is profound, and I am saying that it refers to Christ and the church.' In other words, from the beginning, manhood and womanhood were designed to display the glory of Christ in His relationship to the church, His bride."
~ A selection out of John Piper's contribution to Nancy Leigh DeMoss' book "voices of the true woman movement"
