As shown by Oprah Winfrey and Gayle King, similarity is the primary force that draws us to our friends (Parks & Floyd, 1996). This is true across ages, genders, sexual orientations, and ethnicities. One practical implication of this is that when your interests and activities change, so do your friendships. If you change your political beliefs or suffer an injury that prevents you from playing a beloved sport, friendships related to those things may change as well. Some friendships will endure—the focus of the relationship shifting to new points of commonality—but others will fade away. One of the most common reasons for friendships ending is a change in shared interests and beliefs (Miller et al., 2007).