"Humanae Vitae" is an encyclical issued by Pope Paul VI in 1968. It addresses the Catholic Church's teachings on human sexuality, marriage, and responsible parenthood. The document emphasizes the importance of natural family planning and the moral implications of artificial contraception. The encyclical reaffirms the Church's stance on the sanctity of life and the unitive and procreative purposes of marriage. It argues that couples should be open to life and that any act of contraception undermines the divine plan for human relationships and family.