OK, for all the retards that don't understand the saying, let me break it down. Tits on a nun would be worthless, because she will never use them. Although you may have tits that work, Nun, you will never use them, seeing as how Nuns practice abstinence. You will never need to use them, seeing as how you will never have children, and men will never see or touch them, because you will never engage in sexual activity, thus, making your tits worthless. This is a much better saying, because nuns have tits, bulls do not. Now go say 5 Hail Mary's, and repent, for letting that priest touch your tits. ;)