The more primitive and aggressive the society, the more strict and elaborate the set of incest prohibitions and the fiercer the penalties for their violation. The reason may be economic. Incest interferes with rigid algorithms of inheritance in conditions of extreme scarcity (for instance, of land and water) and consequently leads to survival-threatening internecine disputes. Freud said that incest provokes horror because it touches upon our forbidden, ambivalent sexual cravings and aggression towards members of our close family. Westermark held that "familiarity breeds repulsion" and that the incest taboo - rather than counter inbred instincts - simply reflects emotional reality. Both ignored the fact that the incest taboo is learned - not inherent. We can easily imagine a society where incest is extolled, taught, and practiced - and out-breeding is regarded with horror and revulsion. The incestuous marriages among members of the royal households of Europe were intended to preserve the familial property and expand the clan's territory. They were normative, not aberrant. Marrying an outsider was considered abhorrent. III. Suicide Self-sacrifice, avoidable martyrdom, engaging in life risking activities, refusal to prolong one's life through medical treatment, euthanasia, overdosing, and self-destruction that is the result of coercion - are all closely related to suicide. They all involve a deliberately self-inflicted death. But while suicide is chiefly intended to terminate a life - the other acts are aimed at perpetuating, strengthening, and defending values or other people. Many are appalled by the choice implied in suicide - of death over life. They feel that it demeans life - i.e., abnegates its meaning. Life's meaning - the outcome of active selection by the individual - is either external (i.e., God's plan) or internal (i.e., the outcome of an arbitrary frame of reference). Our life is rendered meaningful only by integrating into an eternal thing, process, design, or being. Suicide makes life trivial because the act is not natural - not part of the eternal framework, the undying process, the timeless cycle of birth and death. Suicide is a break with eternity. Sidgwick said that only conscious (i.e., intelligent) beings can appreciate values and meanings. So, life is significant to conscious, intelligent, though finite, beings - because it is a part of some eternal goal, plan, process, thing, design, or being. Suicide flies in the face of Sidgwick's dictum. It is a statement by an intelligent and conscious being about the meaninglessness of life. If suicide is a statement, than society, in this case, is against the freedom of expression. In the case of suicide, free speech dissonantly clashes with the sanctity of a meaningful life. To rid itself of the anxiety brought on by this conflict, society cast suicide as a depraved or even criminal act and its perpetrators are much castigated.