The plague of mankind is the fear and rejection of diversity: monotheism, monarchy, monogamy and, in our age, monomedicine. The belief that there is only one right way to live, only one right way to regulate religious, political, sexual, medical affairs is the root cause of the greatest threat to man: members of his own species, bent on ensuring his salvation, security, and sanity.
Christianity, with its roots in Judaism, was a major factor in the development of the Western worldview.... A basic Christian belief was that God gave humans dominion over creation, with the freedom to use the environment as they saw fit. Another important Judeo-Christian belief predicted that God would bring a cataclysmic end to the Earth sometime in the future. One interpretation of this belief is that the Earth is only a temporary way station on the soul's journey to the afterlife. Because these beliefs tended to devalue the natural world, they fostered attitudes and behaviors that had a negative effect on the environment.
__Donald G. Kaufman and Cecilia M. Franz, Biosphere 2000: Protecting Our Global Environment, 1996
Do continue to believe that with your feeling and your work you are taking part in the greatest; the more strongly you cultivate this belief, the more will reality and the world go forth from it.
__Rainer Maria Rilke
History is particularly important in throwing light on the source of our attitudes about sex because many of the assumptions we make are not necessarily scientific or rational but holdovers of past belief systems that are no longer held by modern society.