The Netherlands’ Cardinal Willem Eijk has said a papal encyclical or other magisterial document may be needed to counter the spread of gender theory and the belief that gender can be a choice over biology. Warning that Catholic parents are beginning to accept that their own children can choose their genders partly because “they don’t hear anything else”, Cardinal Eijk said: “It [gender theory] is spreading and spreading everywhere in the Western world, and we have to warn people…From the point of moral theology, it’s clear, you are not allowed to change your sex in this way. Perhaps a document only on this problem might be an urgent question,” he concluded.