One the most powerful ways of staying close and connected is to jointly focus on something you and your partner value that creates a common focus of interest outside of the relationship. A cause, a project, church or political work that has meaning for each of you and jointly engages your interest and effort can keep a relationship fresh and interesting. Doing things together that we view as beneficial to others is a process that our highly social human brain experiences as rewarding. It is also a way to stimulate the relationship by exposing it to new people and ideas.
Sometimes the interest that aligns us is a physical or adventure activity that we can have fun exploring together. We renew interest in one another by jointly taking on new challenges and opportunities that give us fresh ways of interacting with and viewing each other.