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The real reason is this: when you are busy making love, you are not paying attention, making it possible for predators to attack and eat you. Those with the instinct to seek out a hidden place had an evolutionary advantage. After the brain evolved, various rationalizations for this behavior were developed.

People are also vulnerable to predators while they are sleeping, yet as far as I know (I'm no anthropologist) there are no people who still lead a Stone Age existence who all disperse to hidden, private places in the forest when they go to sleep every night. It's much safer for them to sleep huddled up in a group. So then why would human beings not have evolved to seek out the protection of our fellows while we are having sex?

Again, as far as I know, there are no animals who won't have sex in front of other members of their species so long as they don't feel threatened. But according to your argument, shouldn't they also have evolved to seek out privacy during sex?

To sum up: if private sex is such a great strategy for avoiding predators, why haven't more other species discovered it?

The real reason is this: when you are busy making love, you are not paying attention, making it possible for predators to attack and eat you.

Oh, don't be silly - what predator on earth is going to kill and eat me in ten seconds?