There’s a lot of misunderstanding around the instincts, mostly because of the dumbed-down, commercialized versions of the Enneagram that have become popular online and in a lot of mainstream books. That's where you get ideas like "SX = one-on-one," "SO = being social," or "SP = worrying about your diet." Another big issue is people treating the instincts as something completely separate from the core types, which goes against how they were originally intended to work and leads to a lot of those misconceptions.

In this post I want to explain the instincts from where they actually come from, biology. I'll especially focus on the SX instinct since it's probably the one people misunderstand the most. I think looking at it this way makes it easier to understand both what the instincts are and why they exist. Obviously these are broad descriptions, and instincts are always meant to be understood alongside your core type, so they'll manifest differently depending on the individual.

Introduction

Human psychology starts with survival. At the most basic level, every organism has one overarching goal. Survive long enough to reproduce. Pretty much every behavioral pattern in nature can be traced back to that.

Over millions of years, organisms evolved different strategies to accomplish this. Some survive by withdrawing from danger and conserving energy. Others survive by forming groups and cooperating. Others survive by competing directly, establishing dominance, and maximizing reproductive opportunities.

These survival strategies are shared across all life. Civilization has changed how they show up, but it hasn't removed them. Every human is trying to survive and continue their genetic line, so we all use these strategies to some extent. They're relational strategies that develop through our interaction with the environment and other people, and most people end up relying on one more than the others because it's consistently worked for them.

Across the animal kingdom, you can roughly divide survival strategies into three broad categories:

• Individualistic survival
• Collective survival
• Competitive or attraction-based survival

Some species survive primarily through isolation, some through cooperation, and others through competition and display. Most species use a combination of all three, but usually one strategy is more dominant than the others. Humans are no different except as very flexible animals we can have any of these as dominant.

The reason people tend to have one dominant instinct is because attention isn't infinite. Life forces us to prioritize. Over time, we naturally lean toward the strategy that has given us the best results, while the others become less automatic. We keep monitoring whatever has historically paid off the most because that's what our nervous system has learned to trust.

SP (better name is Conservation, but SP is the common acronym) is about survival through caution, conservation, and withdrawal. Its priority is protecting the body, preserving energy, and maintaining autonomy. It's rooted in threat detection, energy conservation, and minimizing unnecessary risk. In nature, this looks like prey animals, solitary hunters, and defensive organisms that survive by limiting exposure.

SO is about survival through group cohesion, hierarchy, shared roles, and collective defense. It's rooted in herd behavior, cooperative breeding, kin selection, and primate social systems. This is the instinct most directly associated with social animals.

SX is about survival, or more accurately, continuation, through attraction, intensity, competition, visibility, and magnetism. It's concerned with presence and force of personality. Unlike the other two instincts, and this is where it becomes more hard to understand for some people, it's rooted primarily in sexual selection, meaning evolution driven by reproductive success rather than immediate survival.

This is where you find traits that actually reduce survival while increasing reproductive success. A peacock's enormous colorful tail is a classic example. It's terrible for avoiding predators, but excellent for attracting mates. SX grows out of the same evolutionary logic, mate displays, competition between rivals, dominance behaviors, ornamentation, and visibility.

SX instinct

This is the instinct people seem to misunderstand the most, which is understandable. SX is less about survival itself and more about continuation. Its priority isn't safety or stability but being noticed, desired, impactful, and psychologically engaging. That's why reducing it to one-on-one relationships misses the point. SX types do tend to be romantic, but that is a surface-level manifestation of a much deeper motivational system.

Charles Darwin introduced the concept of sexual selection to explain traits that natural selection couldn't account for. This idea is probably the single best foundation for understanding SX. SP and SO are much closer to natural selection, where survival increases reproductive success. SX is closer to sexual selection, where reproductive success can actually come at the expense of survival.

Sexual selection favors traits that attract mates, intimidate rivals, signal genetic fitness, increase visibility, and create impact. Natural selection rewards traits that help an organism survive long enough to reproduce. Sexual selection rewards traits that help an organism reproduce as successfully as possible, often by standing out.

That's why SX naturally carries a quality of intensity and "going for it." It often values momentum over stability, using display, competition, charisma, and force as its preferred strategy. The aforementioned peacock is probably the clearest example. Its extravagant tail signals health and genetic quality. The willingness to remain highly visible despite predators demonstrates fitness, and reproductive success depends almost entirely on attracting attention.

Other examples include:

- Lions: males compete directly for control of prides. Territorial dominance and combat determine reproductive success.

- Certain birds: elaborate dances, striking displays, and novelty become mating advantages.

In every case, success depends less on hiding or cooperating and more on standing out.

Neurologically, SX also aligns with systems associated with reward and motivation. Dopamine drives novelty-seeking, focus, and pursuit. Testosterone and related hormones influence competitiveness, dominance, and risk-taking. The amygdala and prefrontal cortex help process attraction, social threat, and strategic engagement. Together these systems create a psychological orientation toward intensity and magnetism.

SX naturally asks questions like:

• Who notices me?
• Who reacts to me?
• Who feels my presence?

Its relational style often involves attracting some people while repelling others, asserting itself through intensity, projecting charisma, or creating impact through energy, competence, or personality.

Where SP minimizes exposure and SO moderates itself around the group, SX amplifies relational charge.

SX6

I'll use SX6 as an example because it's another type people often misunderstand. A lot of people wonder what the counterphobic attitude has to do with SX because they're working from the misconception that SX is fundamentally about romance. SX6s are romantic, but it's not usually one of the primary traits in simplified descriptions.

The core passion of E6 is fear. Normally, fear would push someone toward caution and withdrawal. SX6 does the opposite. Instead of reducing exposure, it increases it. Instead of avoiding danger, it confronts it. That's exactly why it's called counterphobic.

SX6 is aggressive, but not in the impulsive, expansive way E8 is. It's aggressive in an SX way. Its learned survival strategy is approaching what threatens it. It compromises safety because the SX instinct consistently pushes toward engagement, visibility, and psychological charge, even when withdrawing would objectively be safer.

Rather than calming fear through distance, SX6 often seeks stimulation. It needs something to push against. It advertises itself, not necessarily by seeking attention, though they do partly, but by refusing to disappear. Even when invisibility would be safer, it chooses presence.

At a deep level, SX6 believes that if it doesn't engage a threat, the threat will dominate it. That's the same instinct behind animals puffing themselves up, posturing, or displaying strength when challenged.

This is what impulsivity looks like in SX6, strategically moving toward danger rather than away from it. And there is certainly an element of attracting mates in this, they consciously or subconsciously worry that not stepping up to a danger makes them less desirable