The women you've slept with, the ones you never did but primed for a future encounter, the ones who seemed interested but then suddenly stopped texting: Unless you do something horribly wrong, they never completely disappear. A lonely night, a cheating boyfriend, a sudden breakup, an attack of low self-esteem, an attack of high self-esteem--anything can, out of the blue, send them scrolling through their address book looking for validation, for security, for conversation, for adoration, for the fantasy of you filling some empty space in her life.