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[–]MarkJefferson 3 insightful - 1 fun3 insightful - 0 fun4 insightful - 1 fun -  (0 children)

Wikipedia:

The pink color represents sexual attraction to the same sex only (gay and lesbian). The blue represents sexual attraction to the opposite sex only (straight) and the resultant overlap color purple represents sexual attraction to both sexes (bi).

— Michael Page