Does anyone know how the green M&Ms as an aphrodisiac thing got started?

According to the Urban Legends Reference Page:

The rumor that these green candies are an aphrodisiac apparently started or first gained prominence in the 1970s, when students reportedly picked the green ones out of packages to feed to the objects of their desires. (At that time, an average of 10% of plain M&Ms and 20% of peanut M&Ms were green.) Why the green M&Ms were attributed with this power is unknown; perhaps it was because the color green has always been associated with healing and fertility. (The company itself routinely states that they "cannot explain any extraordinary 'powers' attributed to [green M&Ms], either scientifically or medically"; the same "powers" have also been claimed of green jelly beans and gummi

bears.)

great marketing stategy & ploy by M&Ms