From an age of worshipping sex and reproduction in total ignorance, our ancestors developed through times of promiscuity and communal marriage, and eventually to today's system of monogamous marriage.
我們的老祖宗從對性與生殖一無所知的性崇拜、生殖崇拜時期，經歷了雜交、群婚… …，發展到如今的一夫一妻制度。