1. Prologetic Remarks; 2. Social Contract Theory; 3. Evolution of Social Behaviour and Sociality; 4. Contractevolism: An Evolution-based Moral Theory; 5. Hume's Barrier and Moore's Fallacy; 6. Contractevolism and Patriarchy; 7. Individual Sovereignty and Copulatory Choices; 8. Contractevolism and Overpopulation; References.