When analysing women's literary activity, it is easy to overlook the fact that most writing by women was never destined for publication. Women wrote only a very small percentage of the printed pamphlets of the 1520s. However, there is much to suggest that they took issue with Reformation ideas in the letters they were accustomed to writing to family and friends. Nuns' families used letters to try to convert nuns to Lutheranism and persuade them to leave their convents. Four pamphlets containing letters to and from nuns suggest that such family debates could become polemical in nature. The reason why 'private' letters were printed are examined in this article, as weil as the different positions of the writers and recipients.