yes it is a tricky one this topic, i have to admit. even in the plant kingdom there is pologomy in some sense of the word, if it was looked at like a "normal" relationship. i.e. a bumble bee has to pollonate a flower for the flower to survive, the bee takes the necta and turns it into honey! then other bees also settle on the same flower some time later. this could be perceived as pologomy i guess?!!!? i know it sounds odd but in respect this could be likened to any sort of "natural survival" of a species! when the world was young and the human race began its global dominance, everyone lived in tribes. monogomy was the way forward in that tribes survival as most would of been related in some way.[maybe im biting off a bit more than i can chew here] now as time has come forward and mankind is made up of different cultures customs and colour monogomy has in a sense is not taken as seriuosly as it once was! [i really hope this makes sense ive had to read it four times!!!!] but within a small unified relationship as you said denuseri, unless there are radical changes, especially to the "emotional" side of our genetic make up, monogomy is and should really be kept high on the priority list.
and thanks again thir, most intresting.