Why Christians Hate Pink
"... Thus, the double charges of the secularists, though throwing nothing but darkness and confusion on themselves, throw a real light on the faith. It is true that the historic Church has at once emphasised celibacy and emphasised the family; has at once (if one may put it so) been fiercely for having children and fiercely for not having children. It has kept them side by side like two strong colours, red and white, like the red and white upon the shield of St. George. It has always had a healthy hatred of pink. It hates that combination of two colours which is the feeble expedient of the philosophers. It hates that evolution of black into white which is tantamount to a dirty gray. In fact, the whole theory of the Church on virginity might be symbolized in the statement that white is a colour: not merely the absence of a colour. All that I am urging here can be expressed by saying that Christianity sought in most of these cases to keep two colours coexistent but pure. It is not a mixture like russet or purple; it is rather like a shot silk, for a shot silk is always at right angles, and is in the pattern of the cross."
G.K. Chesterton, Orthodoxy