The major signs of complacency stem from a lack of effort made and can usually be seen when the honeymoon period ends. This can be something as simple as the effort you put into your appearance or choosing to not have quality time with your partner when given an opportunity.  A lack of sexual intimacy is a sign that affects many relationships. When you settle with your partner you become comfortable, and in reducing the efforts made within your relationship you naturally decline in sexual activity. It’s something that is caused by both the lack of energy and effort and is usually influenced by high-stress levels or simply tiredness.  Before starting to battle complacency, you must evaluate what the actual issues are and communicate this with your partner before agreeing to work on this.