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This topics seem to be widely debated (on unreliable sites):

As you might imagine, some of these links are NSFW (Not Safe For Work).

What evidence is available to support that oral sex is or is not instinctive behaviour in humans?

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raise a kid without exposing them to such things and see if they develop the behavior, good luck doing that – ratchet freak Feb 23 at 1:36
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It could easily be argued that coitus is very instinctual. All animals that reproduce sexually exhibit mating behaviour (to include humans). As to oral sex and kissing, there are numerous analogues outside humans for that behaviour as well (for instance the fellatio performing bats). Add to that the extensive research on positive reinforcement of behaviour brought on by pleasure (or specifically the release of endorphins in the brain which happen with all these behaviours). – Larian LeQuella♦ Feb 23 at 3:04
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@LarianLeQuella: The apparition of a behavior in the animal kingdom does not necessarily mean the behavior is innate, no matter how widespread. It could still be a meme (in the biological sense). – Borror0 Feb 23 at 5:01
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That it is not a common practice among many of the uncontacted tribes of the amazon would lead me towards no. I suspect that as general cleanliness increases the willingness to attempt such things increases as well. – Chad Feb 23 at 20:06
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In really short, I think that yes it is instinctive in animals. I don't usually use cracked.com as a reference, but they have this really nice articles on animals sexuality (which is by itself quite well referenced). The most important part for you question will be section 3) of the article, where they discuss a species of dolphin that practices oral sex (and some even stranger things). You have also the canonical exemple of the Bonobos.

As @Dave Hillier commented, the fruit bats also practice oral sex. There is this PLoS ONE article on how they use it to prolong copulation time.

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It seems to be present in fruit bats too: msnbc.msn.com/id/33587754/ns/technology_and_science-science/t/… – Dave Hillier Feb 25 at 21:59
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Bonobos are genial. They use sex as the main exchange coin to get their society going. They have it better than us. ;-) Unfortunately, though, humans are not bonobos or fruit flies. So does it apply to us, too? – Sklivvz♦ Feb 25 at 22:48
@Sklivvz Of course we are not bonobos or fruit bats, but then we are back to the argument of nature vs nurture, and this can't be answered now (that I know of). But the idea is that we consider most animals as having mostly instincts (maybe more fruit bats than bonobos) and they show a certain behaviour. We thus can suppose that the same behaviour is maybe instinctive to us. I don't what kind of experiment could do better (of course isolating a couple of babies and checking how they grow and evolve together might bring the answer, but I doubt this will be done soon). – Zenon Feb 26 at 0:58
It was not a matter of nature vs nurture. It's just the fact that different species have different genomes, and thus, different instincts. For example read here: news.sciencemag.org/sciencenow/2009/10/30-02.html - finding new species that perform oral sex is worthy of publication as of 2009, meaning that it's not so obvious that it's an undisputed instinct... – Sklivvz♦ Feb 26 at 1:55
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up vote 3 down vote

If oral sex is done first, followed by penetration, the saliva could help prevent STDs (like bats) - which may or may not have been enough allow selection of such behavior in our own species; or it could be an evolutionary left-over.

But I don't think we have enough evidence for our own species to answer that question with any confidence.

Does Oral Sex Confer An Evolutionary Advantage? Evidence From Bats: http://scienceblogs.com/thoughtfulanimal/2010/05/does_oral_sex_confer_an_evolut.php

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