 Different versions associate different colors with sex acts (similar to the handkerchief code).For example, purple might be associated with kissing, red with lapdancing, and black with intercourse.Some versions said the involved action occurs at parties held for the purpose, making them similar to contemporary rumors of "rainbow parties", a gathering at which groups of girls wearing varying shades of lipstick supposedly take turns fellating their classmates, leaving an array of colors on their penises.