The transmission of life associates man and woman with the creative action of God. It is an act of love because it prolongs the act of love made by God who is all Love and therefore totally free. In the eyes of the Church, human sexuality is less instinctive than hedonist morality wants us to think. It is in the domain of freedom and human responsibility; it cannot be delegated to technicians or abandoned to techniques.
CBCP PASTORAL LETTER: "LOVE IS LIFE" (1990)
http://www.cbcp.net/documents/lovelife_90.html