Do you know how to "flirtext"? No? Prepare to be single for the rest of your life then. Flirtexting is what women "have to learn" to keep up with the 21st century dating scene, according to Olivia Baniuszewicz and Debra Goldstein, the authors of a new book called Flirtexting: How To Text Your Way To His Heart, who describe themselves as "graduates of The Rules and He's Just Not That Into You"). Now that we live in the "A.C. world of dating"—that stands for "after cell"—it's essential that women be comfortable with flirtexting etiquette, the duo claim, although men can still send the same old boring text messages they've always sent. (Flirtexting isn't for men, since it's a little "girly," explain the authors.) But if all of this sounds a little sexist and clichéd, well, think again.