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Societally sanctioned relationships do obtain a social benefit in keeping the relationship going. External expectations of fidelity, duration, depth, value -- these serve to re-enforce what is already there.
In short, "my husband" carries far different connotations than "my boyfriend".
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per·son \ˈpər-sən\ (noun) - an ephemeral collection of small, irrational decisions
The fun thing about evolution (and science in general) is that it happens whether you believe in it or not.
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