By Cam Vigliotta There are many gifts that have come to define Valentine’s Day, some obvious and others odd. Lingerie, for example, is an obvious gift that oozes sex and romance; a lock of hair, on the other hand, is rather strange. But chocolate is a timeless Valentine’s Day gift that traces its roots to the Mayan civilization, the Aztecs and early European royalty. And when Cadbury unveiled the first heart-shaped box of chocolates in 1861 to instant success, the rest, as they say, was sweet history. While there’s still no concrete evidence to support the use of chocolate as an aphrodisiac, t…