Love is in the air as Barbara Levine and Paige Ramey take on humankind's oldest pastime: kissing. In racy candids, humorous vintage postcards, and snapshots taken on the sly, couples from the Victorian era through the Swinging Sixties smooch, canoodle, neck, and spoon. The collected photographs are sweet, sincere, and saucy, occasionally awkward, and always intriguing: Who took these photos? And what lay in store for these amorous couples after the...