It is difficult to maintain romantic passion in a long-term relationship.
Eli Finkel states that we want our partner to support us when we are in need and weak, but this is not conducive to igniting sexual passion in a relationship. There is a juxtaposition between wanting a relationship to be warm and loving but also having naughtiness and impropriety.
Satisfaction and connection increases with the amount of time we spend doing comfortable activities with our partners. However, research suggests that we need to engage in novel and exciting activities with our partners in order to fuel sexual fire and passion.