imo there are two important factors which have changed sexual dynamics over the last 50 years:
1. female equality: suffrage, rights, financial emancipation and resultant gender roles;
2. overall longevity across the board.
the results:
1. female selection criteria for males is changing in heterosexual relationships
2. marriage is happening later (if at all) and children are being born later in life (approaching a decade after reproductive peak).
http://pewresearch.org/pubs/1586/cha...erican-mothers
http://www.dailymail.co.uk/health/ar...ily-later.html
what does this have to do with monogamy?
1. if you're horniest in your twenties, and aren't forced to marry at minimum age, and only want to settle down in your thirties, monogamy isn't necessary in the interim.
2. if you've learned to be self-sufficient in your twenties, is a lifelong partner really necessary for raising a child?
sure, it's reductionist. but i'm not really trying to make any value judgements here. i'm just trying to highlight nerfherder's earlier comment: what's "natural" / historical / normative isn't necessarily the best course forward. it seems to me that humans adapt to environmental pressure and then try to normalise the response. the problem is that external factors [population explosion / global competition / contraception / post-war depression / wealth / health / future scarcity etc] have changed so fast in the past 50 years, that norms are battling to catch up.
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