Cindy Chupack has the credentials to comment on the single life: she's an Emmy-winning writer for Sex and the City. Like that show, her witty first book, The Between Boyfriends Book, captures the sometimes angst-ridden world of single women. Chupack has created a smart vocabulary that describes the indignities of dating. To be Lone Rangered is to have a relationship end with no goodbye. Relocationships require moving to a place where you never wanted to live. And male harems are an idea whose time has come, says Chupack. Go for quantity not commitment.