7. Thou shalt not commit adultery.
Okay, this ones moving away from the society thing again. I mean, you certainly should break a marriage contract with someone, that's bad. But really, this is going into the top 10 commandments from god? How about no pedophilia? Or no rape at all for that matter?
This one is actually feministic. Limiting sex to marriage guarantees that as a woman, you won't be left with a child and a father who runs away. This one is protecting the mothers, and even though the "family being the cornerstone of civilisation"-line is very cliched, that does not make it any less true.
Very positive.
Only if the term "adultery" (in whatever original language and connotation it arises from) covers
all extra-marital sex (i.e. including the
pre-marital stuff). A married man and a (differently) married woman reproducing actually doesn't do too much harm in itself, and as such conceivably (NPI!) leaves the child with a caring father even if not their biological one. (The woman's actual husband might have objections of his own if he ever
deduces or is otherwise informed of any deception that took place, to which the "Do Not Lie" commandment would either be most appropriate or most
counter-productive, depending on circumstances. Without the serious examination of physical traits or anything that would later become genetics/etc, I'm sure there were very happy lineages that were different on paper to what reality actually was, in the long-run.)
While there obviously will have been a prohibition against pre-marital relationships (and probably the historical equivalent of shotgun weddings to sort out some of those that
did happen, I don't believe these are covered at all in any modern reading of the ten commandments, although I'm sure an interested party can still find something in Leviticus, or elsewhere, to justify the resulting societal condemnation.
(Yeah, still catching up a bit. But now I've started to chatter on this long-watched thread, it appears I'm addicted to doing so.)