text: Part 5
  
  Again to the Church’s glory, it does appear that this clear-heading thinking about sexual orientation long accepted in Catholic moral theology, is not yet fully accepted by all secular peoples or cultures or legal system, although it is now taken as virtually self-evident by almost all educated people, and by the overwhelming majority of young people of high-school age in western democracies.
  
  This understanding of sexual orientation as a fact of nature is essentially what zoology, ancient and modern, has long called instincts or drives. Instincts in scholastic philosophy are understood in terms of their objectives, their “final causes,” the activities towards which they move us.