" Rule one: Make them curious, slightly jealous. Rule two: Don’t appear too interested. Always be polite. Rule three: Give them a method of contact, but keep the ball in your court. Rule four: Never answer the first text, call, e-mail, etc. For some reason, the brain picks up on the number three as being the final try before you look desperate. "

― Rachel Van Dyken , The Matchmaker's Playbook (Wingmen Inc., #1)