It's difficult to find good book lists. Either they're too long or they go into a huge amount of detail. So I was delighted to find this list of books and films on the website of the wonderful Pontifical John Paul II Institute for Studies on Marriage and Family.
What's particularly interesting about this list is that it is related quite explicitly to research on St John Paul II's Theology of the Body (or Catechesis on Human Love or the Anthropology of Love). I would have thought that the books and films recommended here would be particularly suitable for 15 years +