Population slowdown and polygamy

Singapore Lee Kuan Yew has said that monogamy is an Occidental invention and that polygamy should be the rule. Probably, as a way to correct Asia's descending birth rates. On the other hand, it is so tempting to say that the human race --just as our brother primates--, has been essentially polygamous throughout most of its 200.000 years. And, to be sure, monogamous men and women are usually having a hard time keeping their for life exclusive sexual contract. So I start to daydream about the pleasures of having two or three wives. And suddenly the danger of such an enterprise, the psychological cost of it appears. But I would like to try a polygamous family life. And am alert as to Lee Kuan Yew's personal course and love life.