This Catholic Church document, Persona Humana, was released in 1975 to help refute the growing confusion and relaxation of morals in the world. In particular, this document firmly restates the church's teaching on sexuality.A few topics are explicitly mentioned, including pre-marital sex, homosexuality, and masturbation. The "fundamental option," which says mortal sin is rare and only occurs when someone totally commits to turn away from God, is also refuted.The document is short and can be read in about an hour. It's a good and orthodox choice for those who want to know more about the Church's teaching on sexual ethics.