God's Word is full of such instructions for each situation. They aren't out-dated rules that God is trying to use to turn believers into robots. They are principles and instructions that help people to live healthy, happy, and long lives. Every society since the beginning of the human race has chosen its gods. Mankind recognizes that there are powers greater than man that work in the world and in men's lives.
Science is the god of many people in our culture and the modern world.
The behavior that science condones today is found to lead to society's decay tomorrow. No matter how much science, religion, and philosophy try to get away from God and Christianity, their is no other value system that can replace the truths found within God's Word. God teaches us to put others before self. If everyone followed this principle, our world would be a great place to leave to our children. Instead, we are turning over a struggling and dying world to them.