Yeah... What ya said makes pretty much sense... ALOT in normal
human's context and studies... 
Refer to what you've posted again...
Why does it reminds me of the question, "Chicken 1st or egg 1st?"
What you've stated in your above post is a rather 'standard'
human's strand of thoughts and study... Especially so in terms of
empirical science... SCIENCE, as itself would implies... Probably
would be studying on the QUESTION of 'reproduction' than 'love'....
In fact, you should quickly realise that 'love' is hardly a subject
of its studies other than the more limited objective forms and
definitions... And no no... I'm not saying science is wrong in
stating love in those ways... But it's just one form of looking at
things... And since 'reproduction' before the 'love' is the central
subject of study, the latter is often seen as a 'by-product'.. Thus
the question of "Chicken or egg 1st?" And this phenomena has been
explicitly seen throughout human's history... How humans used to
think of themselves (or Earth) as the central of universe.... Just
because they've been studied 1st... (especially in philosophies...)
In fact after all these years, though humans have slowly learnt
that could be quite a big mistake... They often just repeat the
mistake in different ways...
And it is INDEED TRUE that our 'intelligence' have allowed us to
tag more meanings to 'love' these days... And in some cases, yes...
Some 'definitive thoughts' are almost largely abused... But coming
back to 'intelligence'... Isn't that also what makes you 'realised'
today that love could be a evolved instinct of reproduction...?
Rather than 'overly tagged' with meanings (common scientific
belief), how about 'overly simplifying' of things...? (problem with
empirical science studies) Especially during the 'early stages' of
studies... Just seems to make things a whole lot simplier now...
Doesn't it? 
Hope you don't take all these discussions too personally... But
sometimes to argue under the grounds of 'science', you've got to
understand where it all comes from and where can it reach out
to....
And now just a food for thought... Is 'love' really just an evolved
instinct from reproduction to be belittled...? Or is it suppose to
be an evolved instinct which could be leading us to somewhere
further...? Think 'natural selection', 'evolutions', e.t.c.
