Indeed the social bond which should exist between God and us is violated when the nature of which he is the author is polluted by a perversion of sexual desire.

confessions, iii.15

interesting that st augustine seems to be the first (other than st paul, of course) to boil the root problem of sexual sin down to a crime against community. sexual sin is, then, a more grievous sin because it's more innately destructive to community. right?