there are a meriad of inherant behaviors, the logic of these behaviors may not be totaly understud by us but we follow our instincts as would any other animal,
amung these instints include a sence of justice, a sort of balence between "good" and "bad"
good being things that our instincts determine as something benifecal
bad would be the oposite
oftine our instincts conflict
for instance sex, we have a very strong urge to procreate, most oftine we do not think of the outcome however, there are thus a serese of counter instincts that try to hold you and you're mate together and this has led to a whole host of marage like arangments throughout the world, there are in fact very few cultures that do not hold manogonis (note: I do not mean exlusive) relationships as being extreemly important, this is one of the places love comes in to hold people together wich goes into the famely structure wich then goes into the larger cultural alignment (what ever you define yourself as, most people today ether culturaly define themselves primaraly by nation or religon)
all emotions and ethical sences serve a logical role in the survival of our specise,
ethics are compsed of both biological and cultural elements,
evolution plays on both the biological and cultural components of emotions and ethics,
changes in ethical systems can only ocur quickly on the cultural elements,
the biological elements will remain vurtualy unaltered