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You're halfway there. Evolution gave us a huge sex drive, all the better to fulfill the basic evolutionary drive to
"Be fruitful and multiply". Evolution also gave human females a monthly estrus cycle, rather than yearly.
But then, evolution created some nasty problems. One, it gave us huge brains... so huge, in fact, that unlike other animals, we had to bear our infants long, long before they're capable of walking or caring for themselves. In fact, evolution had to allow
babies skulls to be collapsible just to be able to get through the birth canal.
That meant that human children have to be cared for, at the very minimum, for 8 to 10 years, by both a mother - to nurture - and a father - to provide. Add siblings and the time and responsibility increases by parents increases.
Not to mention that the children have to be taught the vast amounts of knowledge required for a young human to assume their role as contributing members of the tribe.
THEREFORE, while sex is designed to be crazy fun - in order to keep folks doing it - it also leads to procreation, and more importantly,
child rearing, which makes it far too serious a matter to be treated irresponsibly.
THEREFORE, our instincts, our
'better angels', inform us that sex should not be practiced by humans too young to responsibly care for their offspring, that sex should not be practiced without a formal, unbreakable commitment to stay together - for the purpose of raising children, and that activities that threaten the trust and stability of marriage - like adultery - should be harshly frowned upon.
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