Maintaining passion in long-term relationships is a common challenge, but experts say it is possible with consistent effort and renewal. Over time, couples may experience a natural decline in desire, often attributed to the Coolidge effect, where excitement wanes with familiarity and new experiences tend to boost dopamine levels. Despite these changes, couples can reignite their connection by investing in their relationship and seeking new ways to stimulate desire. Personal and couples coach Hila Rubin emphasizes that with dedication, the spark can be preserved and even strengthened over the years.