Gone are the days when the sexually adventurous 20-somethings and newlyweds were the primary suspects scanning your shelves for the latest in erotic lingerie and furry handcuffs. According to studies done by lingerie companies, there has been a 50% rise in customers over 40 spending a small fortune on all things erotic. Another study conducted by U.K. novelty manufacturer Lovehoney found that women over 40 are even experiencing higher libido than those in their 20s. The 40-somethings credit their increased sexual appetite to the likes of "50 Shades of Grey," among other erotic novels. Bottom line? Rethink your target demographic—you never know who will come into your store looking for the whip used by one Christian Grey.