We all know the power of chocolate, so it's no surprise that it's considered an aphrodisiac. Containing both sedative and stimulative qualities, chocolate relaxes and lowers inhibitions while increasing the desire for physical contact. Chocolate was actually banned from some monasteries centuries ago.
The Aztecs knew chocolate as the "nourishment of the Gods," and their emperor Montezuma ate it before many a romantic interlude. Although researchers believe chocolate's ability to act as a sexual stimulant is limited, it seems to be the way into many hearts — hence its prominence on Valentine's Day. Just be sure to make your chocolate dark, since it is considerably healthier than the milk variety.
Source: Flickr User johnloo