I’ve probably been spending to much time in Great Debates but it occurs to me that the barbed penis issue casts some light on the creation\ evolution debate.
From the evolutionary standpoint it doesn’t make sense that sex would be painful since this would disincline Cats to have sex and thus lower their reproductive fitness.
From the Creationist viewpoint it does make sense, since this would be God’s way of teaching kitties that sex is bad! 
Seriously, thanks for your answer Coosa, I’ve wondered about this.
Having an open mind means you put out a welcome mat and answer the door politely. It does not mean leaving the door open with a sign saying nobody’s home