Recently a group of priests re-published a set of texts written by Karol Wojtyla/John Paul II about marriage and family. The book is called The Beauty and The Spirituality of Conjugal Love.
Karol Wojtyla wrote these texts in 1962 while he was the cardinal archbishop of Krakow based on his pastoral experience in the years following the Second World War with young and married peoples.
The point of Wojtyla's writing is to promote communion among people, especially married peoples, so as to live the Christian life. This book is a method of living married life in faith and not as a set of rules and prohibitions. These texts were published again in published 1990s but received little attention. They are now offered again as a guide to marriage in the 21st century.
The video clip on the presentation.