The Greek-illiterate has a question: if κόλπος can mean "any fold" it seems that a particular set of "folds" in the . . . nether regions might be a more reasonable reading. After all, that is where children come from. And it's colored much closer to violet than breasts are (I suppose one could say the areolae are violet, though).

Just a thought. I have no idea if it's a viable one . . .