Friendly demisexual reminder:
Sex without sexual attraction is a thing. It happens every day, if it must be said, whether by people who’re allo or people who’re on the ace spectrum.
Sex-inclined people of any orientation are the most likely to have sex just to feel good and get off, and it doesn’t affect their orientation. (See: Dean Winchester.)
Sex-indifferent people are less likely but still might (usually when the opportunity arises that someone wants to fuck us, and more rarely, we might maybe try). It doesn’t affect theirs either. (See: Sam Winchester.)
Sex-averse/sex-repulsed people are super less likely to have sex for any reason, sexual attraction or not, because aversion/repulsion. But it doesn’t affect theirs either, if it’s for instance, posturing or experimenting or whatever.
Waiting to have sex with someone you don’t know until you feel more emotionally connected and/or trust them more, but still wanting to with them specifically, initially and up until you actually do it, is not demisexuality. (Drooling over someone’s looks in a sexual manner [like “I’d like to see what he could do with this hands” or whatever--as opposed to just noting they’re aesthetically pleasing and/or other non-sexual remarks on their beauty] and the like should not be part of a romantic meetcute from a demisexual’s POV.)
Demisexuality is specifically two things*:
1) An asexual orientation wherein you do not feel sexual attraction to anyone, without a strong emotional connection/bond first, regardless of however many/few (usually few) you can be attracted to when that parameter is met. 2) Alternately, an asexual orientation wherein you do not enjoy sex with anyone because of your type of asexuality but you develop a version of sexual attraction based upon prolonged sexual contact that’s gone well with someone you are somehow connected to, and are that manner of attracted only to them.
*In my experience with many demis, intimacy is key in both of these two things. Real intimacy, more often than not, must be present, or at least feel like it is.
Some things to know about this are: that emotional connection/bond doesn’t have to be romantic, but it is usually fairly strong and generally develops over a decent amount of time, as some romances can. Additionally, you can feel something as strong as romantic things can be for someone and still not be sexually attracted to them when you’re a demisexual, and then feel a non-romantic strong bond with someone else and be sexually attracted to them. Some/many demisexuals require this bond to feel this because of something that means they must really trust someone in order to have sex with them at all, to the point where attraction cannot even arise unless that trust happens, so the passionate whirlwind infatuated romance might not actually induce sexual attraction but the long-term friendship might instead do so.
Also, generally, demisexuals are usually ace 99% of the time and sexual attraction is usually a shock that happens as part of a relationship as a result of this? I admit, some demis feel it arise gradually, but usually, what you’re really describing is a sex-indifferent allosexual or Grey Asexual who is feeling sexual attraction increase over time to the point that it’s becoming undeniably strong and too hard to ignore. I know very few demis who would describe their own awareness of their sexual attraction as a person “gradually becoming sexier” and much more who would describe it instead as “startling” or “sudden” after a while of being around someone somehow and connecting to/with them. Many I have met have said that demisexuality doesn’t feel at all gradual: one week you feel no sexual want for this person, the next week y’do, is very common.
Sex-indifferent (sometimes sex-averse) demisexuality can mean that the demi person fucks them before they’re sexually attracted to them and then maybe later wants them specifically, or it can mean that they never are sexually attracted but later almost feel like they are, start to want them specifically in an almost-attraction manner, because they’re conditioned to associate good things with this particular person’s sex acts in a way that cultivates an inclination rather than an indifferent enjoyment or an averse exceptional pleasure.
What people need to learn to interrogate so as to communicate when they’re explaining or writing demisexuality (among other acespec sexualities) is a) is the specific demisexual person inclined, indifferent, averse, or repulsed?**
**(It also is important to figure out how touch-averse they are and what their romantic orientation and/or level of romantic inclination is. Greyromantic demisexual Castiel might wanna kiss and hold Dean right away, but not based upon sexualized ogling and still might not want to do anything sexual at all with him, ever, or at least not until the bond--as in canon--triggers sexual attraction, at which point he might, unlikely to pursue it as he is being sex-indifferent.)
And then, b) from there, how can you, the writer, express that this person might still want to fuck a person repeatedly without sexual attraction to them, and/or might want to fuck in general regardless of sexual attraction to any people at all, and how can you write to differentiate between that and orientation-affecting sexual attraction?
Example: how can you express that in canon Castiel is arguably sex-indifferent enough that he probably won’t fuck anyone unless they (metaphorically) drop it in his lap AND he’s in the mood that day AND it’s an auspicious situation, without portraying him as your standard allosexual playboy if that’s happened a few times? Without erasing his demisexuality and the fact that he’s only thus far attracted to Dean (unless you come up with an original character he’s known for a long time and whom he trusts) in canon and that itself took a while to arise?
How can you express that without we, the sex-indifferent demisexuals exactly like Castiel who are reading this, feeling like you either don’t understand us enough to write us well or are intent on correcting us to make us seem more allosexual/sex-inclined somehow if you can?
***Additional similar examples: how can you express that Castiel is asexual (less canon and please don’t erase queer-read attraction okay) but sex-indifferent so he’s not bothered by having sex but he doesn’t want anyone specifically? How can you express that Castiel is grey A (less canon and please don’t erase the parameters of his sexual attraction to Dean to do the “easier” acespec orientation where you can more often get away without talking about the lack of attraction bit--though Grey A is more understandable provided it’s still noted Castiel has only thus far been attracted to Dean in canon) and maybe sometimes is more sex-inclined, sometimes is more sex-indifferent?