Besides reducing risk of sexually transmitted disease, what
rational/logical/non-emotional reasons justify permanent (life-long)
sexual monogamy in today's Western societies?
Request for Question Clarification byhedgie-ga
You got some excellent comments to your excellent question,
and thing to do would be to invite one of the commenters, the one you
feel came close to the answer to post the comment and summary of other
comments as an answer.
But perhaps you feel no one came close as yet, and in that case you may
invite others to answer. It is impossible to exclude 'emotional reasons'
(isn't that an oxymoron?) from study of sex, but it is possible to answer
the question from the point of view of antropology,
which does study humans and their amotions in a detached way.
I consider the book of Harvard educated Cornell professor of antropology:
E.D. Chapple: Culture and the Biological Man (1970 Holt, Reinhart, Winston)
to be a good framework. If you want an answer, and summary of comments from
that perspective, kindly post an RFC.
Clarification of Question bycurioussam-ga
Yes, interesting comments have been posted. The clear tendency to
take a anthropology tact seems to reinforce that sexual monogamy is in
place at least in part because of legacy. However, I am looking for
reasons why, we should, today, elect to be monogamous. There may be
emotional reasons for monogamy. However, emotional reasons are
subjective, often culture-biased, and there are emotional reasons
against monogamy. I am looking for rational reasons for monogamy.
Perhaps the answer is there are none.