I'll be more dangerous, more beautiful than any other

Dom-as-control: This may seem obvious or even trivial, but it shouldn't be dismissed: many doms are motivated by an emotional need to have some part of their life where they have total control over what is going to happen. Something that I love about this style of domination is that I always know exactly what will happen next (except if there's some emergency, safeword, or other issue to address.) There are no wild cards in a controlled D/s scene except for those I explicitly allow (like if I ask a sub to choose which whip I'll beat them with.) This is also a reason why I personally have a very hard time switching; I have difficulty with the uncertainty of not knowing what will happen next. It should be noted that this style of domination is fairly incompatible with the bratty style of submission, as the brat is constantly throwing wild cards into the scene.

Sub-as-blankspace: The other side of this coin is the sub who needs to not have to think anymore. They've spent all day deciding what to wear and what to eat and which toothpaste to buy and they just want to stop. This is a very common motivator. This sub needs specific and clear commands from a dom, without too many steps, or else needs to have a well-established protocol of kneeling and service that they can do by pure muscle memory. This sub does not want the dom to offer them a choice of whips they can be beaten with, because that forces them out of the blissful blankspace of not needing to choose.

Dom- or sub-as-service: The same emotional need can sometimes motivate domination or submission! Many people dom or sub out of a desire to please their partner. It's about taking on a defined role that you know will meet your partner's needs. It feels good to be needed, after all. This motivation for D/s is generally the best understood by the public, especially as a motivation for doms. It's generally more socially acceptable to want to control and torment people if you're doing it selflessly in order to please them. A big part of my motivation for making this speech to people, and for writing this post, is to point out that this is far from the only style of domination, and pleasing their subs is far from the only emotional need that doms might have.

Dom-as-whumper: I'm using this terminology because of the website I'm on. I'm not into whumpfic, but I recognize in people who have a visceral need to see their blorbos whimpering and bleeding the same need I have to tear apart a cute kitten with my bare hands, or to crush a sub beneath my booted foot. It's the cuteness aggression approach to domination: sometimes your sub is so cute your hands itch with the urge to destroy them. This is where domination and sadism bleed into each other; this style of domination does not work well for the sub who wants to submit without being hurt or humiliated.

Sub-as-object: Subs who like to be treated as furniture, robots, or objects are often motivated by a need to enjoy a sexual or kink situation while being free of attention and scrutiny. Obviously, some baseline level of attention is needed for BDSM safety; the dom needs to be able to notice if the sub is injured or upset. But beyond that baseline, it can feel very freeing for a sub to be turned on, blissed out in subspace, crying, drooling, whatever, without anyone closely watching or listening to them, so long as they fulfill whatever their purpose as an object is.

Sub- or dom-as-flex: Both doms and subs can be motivated by a need to feel competent. I definitely feel awesomely powerful and competent when I do a style of domination that requires specialized skill, such as hypnosis. Submission can also provide a feeling of competence: look how long I was able to stay kneeling on the hard floor! Look how perfectly I cleaned the room, exactly as Mistress told me to do it!

Dom-as-troll (or mad scientist): The sibling to this kind of dom is the writer who thinks "wouldn't it be fucked up if....?" and then writes a freaky nasty little horror story about it. A great thing about D/s is that you can have a thought like "wouldn't it be fucked up if I tied up my sub and then ate their favorite snack right in front of them?" and then you can just do it (provided you know your sub likes to be tied up and tormented.) Then you can find out how your sub would react to your terrible ideas and laugh evilly at the results. The emotional need being served here is the goblin part of your brain that wants to break things just to see how they shatter. All you need to do is find someone who wants to be broken.

Sub-as-brat: Brats are often discussed as a single type of sub, but in my experience, there are two rather different emotional needs that drive brats. Some people are brats because they need the assurance that they can act out all they want, and it won't derail the action; the dom is strong or skilled enough to subdue them no matter what nasty tricks their goblin brain gets up to. Other people are brats out of a need to live in a predictable and fair moral universe. Those brats want a very clear system of rules and punishments for those rules. Then they test the rules, and they get meted out exactly the punishment they were promised. Within the world of this scene, the world is fair, and the same misbehavior will always face the same consequences, something that rarely happens in the real world. These types of brats are rather different, because the first kind of brat doesn't care as much if the consequences of their misbehavior are inconsistent, while the second kind cares a lot.

Sub-as-beloved-pet: Or beloved child, if they're an ageplayer. I find that subs that like to be a beloved puppy are driven by an emotional need to be loved, treasured, and supported unconditionally, even if they make mistakes, even if they behave messily or clumsily, even if they look silly, because that's how a good pet owner should treat a pet. There might be discipline involved, but the discipline is very supportive and patient.

Dom-as-nurturer: Some doms are motivated by a need to be in a nurturing role that their non-D/s life may not allow them to fulfill. For example, a man who wants to express affection and tenderness to his partner but has a hard time doing so because of the way he was raised may be able to unlock that ability if his partner plays a sweet puppy and he's playing the puppy's doting owner. Basically, the D/s scene creates a little world and a set of roles in which it's expected and normal for the dom to be nurturing, even if that's not true for the dom outside of that scene.

Dom-as-enfant-terrible: The other side of the coin is a dom who needs to be in a role where they can be unreasonable, demanding, and selfish, a role that their non-D/s life may not allow them to fulfill. For example, a mother who spends all day thinking about her family's needs may relish the opportunity to center her own desires without worrying if she's being "too much." She can be impatient and fussy and demand the sub do things over and over until she's satisfied, all of which she can't do when she's working as a teacher or other caring role.

Dom-as-artist: I think this is a hugely under-appreciated motivator for doms. Many have a need to be creative and imaginative that they fulfill through domination. I've been to workshops and demos at kink conventions where I've been awed by another dom's fiendish creativity. I once watched a hypno dom with a sub who got off on being afraid, and he hypnotized her and crafted an extremely elaborate horror scene in the room, filling it with menacing shadows and phantasms. This is where I'm contractually obligated to link A Dom DM because this is where domination overlaps a lot with game running and game design.

Sub-as-aesthetic-object: The flip side of this coin is that many subs enjoy being an aesthetic object or canvas for a dom's art. Very often these are subs chasing a need to feel beautiful, or at least enjoyable to look at. Subs who want to be aesthetic objects may enjoy wearing special outfits during scenes, or being posed in sexy or appealing positions. Subs in this kind of scene may enjoy letting go of worrying about whether they look good to the dom, because the dom is shaping them to their own preferred aesthetic, whether that's via poses, makeup, shibari, or something else.

Sub-as-sexual-creature: A lot of subs enjoy being called sluts, offered up for free use, or otherwise being hypersexualized. Why is that? Well, our society has a lot of shame and repression around sex, and it can feel much easier to relax and enjoy sex if it's couched in the fantasy that you have no choice because you've been reduced to a purely sexual creature. The sub has an emotional need to give up responsibility for choosing to have sex and be sexual, because that responsibility is a heavy weight to carry.

Dom- or sub-as-taboo-breaker: This is a huge motivator for both doms and subs. We all live in a society, and sometimes we feel a need to break the rules of that society. Both domination and submission provide opportunities to do so. It's taboo to piss yourself as an adult, but a watersports scene creates a space where it is acceptable or even desirable for a sub to break that taboo. As a dom, I personally get a huge taboo-breaking thrill from slapping a sub across the face. There's something about the sheer disrespect of it, and the memory of being scolded for doing it as a child, that fills me with impish glee.

Dom-as-hunter/sub-as-prey: For the hunter to catch the prey, there must first be a chase, or at the very least an ambush. This need not be a literal chase (we sent physical acts out of the room, remember?) but it is a dynamic to hunter/prey-flavored BDSM: the hunter has to earn it. This fulfills an emotional need for both dom and sub: a dom who struggles with feelings of unworthiness can feel like they've earned their partner's submission, and a sub can feel that the dom cares enough to put in the effort to catch them. Hunter/prey also allows dom and sub to explore some pretty dark emotions within the safety of consensual kink, such as fear, obsession, and consumption.

Dom-as-shadow: I mean shadow here in the sense of shadow work. Many doms take inspiration from people who bullied them in school (and many subs enjoy re-enacting scenes of childhood bullying in a safe and consensual context.) There is a real emotional need served by claiming the power of those bullies for yourself. Those childhood cruelties can be utterly transformed by the change of context. For example, the catty whispers and sneers of straight girls who bullied me for being queer comes out very different when I perform those same catty sneers as a genderfucky adult.