Of course! It's so obvious!

Someone has finally explained to me why homosexuality is unacceptable! Because of finger-painting:

Anderson's exhibit contains blue and pink paint. The blue and pink colors stand for a man and a woman. When they are put together in a bowl, they become purple, meaning that the man and woman are a cohesive whole once married.

However, when two paints of the same color are mixed, nothing occurs, says the Sentinel. They must therefore mix together outside of the bowl and that makes, as the display puts it, "a big mess."

I'll file this with other homophobic analogies that show the level at which these people operate.