Answer:
human sexuality as it can be known by the human person on the basis of spontaneous observation and reflection. It is in those truths of nature and purpose that the specific ethical norms for personal and societal life in the matter of sexuality are rather immediately discovered. The appeal here is not to authority (except insofar as truth by intrinsic evidence commands acceptance) but to common observation and the basic testimony of human history; the meaning and normativity of human sexuality can be known with certainty in this way. Old Testament Judaism and New Testament Christianity have confirmed and deepened this universal understanding.
