Woooooow, guys take a chill pill as it were.
Without wanting to get involved in this, I would agree that love, lust and the like are biological impulses, however I would question your view that love is just a concept of society and nothing more than lust. Sorry for being a bit vague, but I dont particularly want to get into this discussion for obvious reasons.
Anways guys, lets just agree to differ and move on?