In new relationships, feelings of sexual desire for a partner come relatively easily. But, over time, partners’ sexual interests often change and it can be difficult for couples to keep the spark alive. In the beginning stages of relationships when partners are getting to know each other sexual desire tends to peak (Baumeister & Bratlavsky, 1999), and then often declines over time as partners become comfortable and committed in their relationship (see review by Impett, Muise, & Peragine, 2013). Given this, most romantic couples will encounter times when their sexual interests differ (...