When one has a select, handpicked list of people who they find attractive, beautiful, sexy, intriguing, et cetera. A lot of the time, it includes people way out of one's league. For instance, mine includes Louis Tomlinson, Alexander Ludwig, Logan Lerman, Liam Payne, Zayn Malik, sensing a pattern here... you get the idea. Basically a list of people that make you go asdjalsdhfalksgfasl. Some people in relationships also see this as their 'Cheat List'- e.g. the list of people that they're allowed to cheat on their significant other with, or the people they're allowed to shift and the aforementioned significant other will let it slide. Good for references and daydreaming. Constantly subject to editing.
Girl 1: Who's on the first page of your catalogue?
Girl 2: Hmm, tough one. Alexander Ludwig, Louis Tomlinson, Liam Payne, end of until further notice.