So, what are some other factors that contribute to the glue that keeps couples together ?
Do you need to have the same interests? Not necessarily. It is important to take an interest in your partner/spouse's favorite activity, but you do not have to share the same level of passion. Sometimes just going to the boat show with him and commenting on what you are learning becomes an intimate sharing experience. Or watching her playing a fast game of pickle ball can show that you share her passion, but at a different level.
However, couples need some shared interests as well as individual interests, so it is important to have some shared interests too. Those can involve time with family, re-designing a part of your home or any activity which if focused on your interaction together.