A letter from J.R.R Tolkien to his son. Although a good Catholic, he admitted that men were instinctively polygamous and could happily beget a few hundred children, while women are naturally monogamous.
http://glim.ru/personal/jrr_tolkien_42-45.html
>You may meet in life (as in literature) women who are flighty, or even plain wanton — I don't refer to mere flirtatiousness, the sparring practice for the real combat, but to women who are too silly to take even love seriously, or are actually so depraved as to enjoy 'conquests', or even enjoy the giving of pain – but these are abnormalities, even though false teaching, bad upbringing, and corrupt fashions may encourage them. Much though modern conditions have changed feminine circumstances, and the detail of what is considered propriety, they have not changed natural instinct. A man has a life-work, a career, (and male friends), all of which could (and do where he has any guts) survive the shipwreck of 'love'. A young woman, even one 'economically independent', as they say now (it usually really means economic subservience to male commercial employers instead of to a father or a family), begins to think of the 'bottom drawer' and dream of a home, almost at once. If she really falls in love, the shipwreck may really end on the rocks. Anyway women are in general much less romantic and more practical. Don't be misled by the fact that they are more 'sentimental' in words – freer with 'darling', and all that. They do not want a guiding star. They may idealize a plain young man into a hero; but they don't really need any such glamour either to fall in love or to remain in it. If they have any delusion it is that they can 'reform' men. They will take a rotter open-eyed, and even when the delusion of reforming him fails, go on loving him. They are, of course, much more realistic about the sexual relation. Unless perverted by bad contemporary fashions they do not as a rule talk 'bawdy'; not because they are purer than men (they are not) but because they don't find it funny. I have known those who pretended to, but it is a pretence. It may be intriguing, interesting, absorbing (even a great deal too absorbing) to them: but it is just plumb natural, a serious, obvious interest; where is the joke?
>They have, of course, still to be more careful in sexual relations, for all the contraceptives. Mistakes are damaging physically and socially (and matrimonially). But they are instinctively, when uncorrupt, monogamous. Men are not. .... No good pretending. Men just ain't, not by their animal nature. Monogamy (although it has long been fundamental to our inherited ideas) is for us men a piece of 'revealed' ethic, according to faith and not to the flesh. Each of us could healthily beget, in our 30 odd years of full manhood, a few hundred children, and enjoy the process. Brigham Young (I believe) was a healthy and happy man. It is a fallen world, and there is no consonance between our bodies, minds, and souls.