Afaik, this is mostly a stereotypically male thing – wanting to sexually progress as quickly as possible.
For the record, women do not really feel that way, especially Victim women. For a woman, the success of a courtship is not being measured by how rapidly and quickly it progressed, for the most part. (Though there might be the exception for some Aggressor or IEE SX women.)
Neither do all Victim women like "crude sexual humour" either, especially not in the beginning stages of a courtship. I know of Victim women who wouldn't be into that. Part of it is probably simply socialization, another part of it is instinctual stacking.
Sp/Sx Aggressors with an 8 fix seem to be the most "crude" early on, in my experience. SX first Aggressors with an 8 fix can be rather crude too, but they tend to let that out later on, and mostly once the sex act is very close, and not in the early stages of courtship. I'd say it's because Sx/Sp is synflow and tries to withhold their Sx in some way and be more acceptable, and Sx/So is more aware of social dynamics and customs and hence tends to be more outwardly "civilized", at least initially, though there can be some outliers.
Anyhow, I'd say that SX blindspot and SO first Victim women, and perhaps some very socialized SX first ones, won't be into "crude sexual humour" (early on). Having said all that, it also depends on what or who the humour is directed at. If the guy happens to make sexual jokes in a more general manner, it could be fine. (I'm thinking of comedians like Louis CK or Dane Cook here, who are both Sx first – Sx/So and Sx/Sp respectively – and make sexual jokes in that way.) It becomes tricky once those jokes are directed at her, and especially once they cease to be actual jokes and are just obnoxious ways to hit on her.
Beta NFs tend to expect a courtship to be somewhat "regal" in a sense, being aristocratic Victims. EIE men are like
troubadours; I am rather certain that the overwhelming majority of troubadours back in the day were EIE men.
Beta descriptions mention 19th century courtship to be characteristic of Beta (NF) romance, but I find
Courtly Love from the 11th/12th century to be a much more fitting analogy.
Courtly Love was about "winning over" a woman with chivalrous behavior, songs, and poetry. I tend to find this kind of attitude residing in most (if not all) Beta NF men naturally; as well as in some Gamma NT (Ni subtype), and in some Gamma SF (Fi subtype), and even in some ESE and IEE men, though for the latter it is mostly a "role" they play and not who they really are, whereas Beta NF men (and some Gamma men) just "are" that way.
It's going to be quite rare to meet a Beta NF who will be openly and directly sexually crude, especially in the beginning of a courtship. Victims, especially the Beta ones, tend to have a specific shyness or cautiousness when it comes to the progression of a romantic relationship. They need to be continually "convinced" that it is worth it and has future potential and that the other person is truly interested in them, and they are truly interested in them themselves. Some Victims (especially the Gammas) need to be directly told that they like you in order to "go for it"! A direct, provocative "I know you like me!" can bring an ILI out of their stupor. There are some very shy Victim-Ni subtype men out there who need that same kind of direct person to show them that there is actually "something going on".
In that context, I know of a failed courtship between an EIE man and EII woman. The EIE man invited her to his home as a first date (they'd met online). You'd think this is definitely going to lead somewhere sexual... She arrives, they mostly have a good time. They cook and do some chit-chat. The EIE is unsure about his degree of attraction towards her, the EII senses that (with her strong Fi). She even gives him a kiss in the kitchen, and he does or says nothing! Continues doing what he's done before, as if nothing had happened! Later, the EIE offers her to sleep at his place (!) because it's already gotten late and traveling back home takes a couple of hours for the EII. So the EII agrees, and they sleep in the same bed (!), but all he does is cuddle with her. The next day, she travels back home. Their budding romance had died off rather quickly. Now, you could say that she must have looked terrible in real life, and that's why he rejected her. I don't think she looked that different in real life, very slightly worse at most; it is not like she tried to hide what she looked like, she did even make some videos that showed her rather well. I'd say that she wasn't bad looking, but she was probably not as good-looking as he had imagined in his romantic mind. Being a Victim, that put him into a great conundrum, being unsure about his degree of attraction towards her, whether it is enough for a relationship or not. Apparently, the EII tried to help him out with that, but it didn't really hit the mark. Every other man who'd at least want to get laid would have seized the opportunity at the very last once she was willing to sleep over in his bed! But no, he did not! I'd say that he probably did like her a lot in a platonic sense, but he couldn't see a future with her (for various reasons), and that's why he kept their interaction platonic and non-sexual. Who knows, maybe he would have had sex right then and there if she had been an LSI or ESI, but even that I doubt. He was (an older) SX first and looking for a long-term romantic relationship; and being a Victim, he wouldn't go for something that didn't have a future. This kind of attitude is quite common for SX Victims. Other men would have thrown all caution to the wind, especially Aggressor ones, and just ended up sleeping with her for the momentary pleasure in the present. Getting to know someone, and based on that knowledge knowing whether there'll be a future together, takes some time...
As a bonus, here's a classic example of male Beta NF (here: IEI) courtship behaviour. Debra Berndt-Maldonado, author of the book "Let Love In", and who's IEI herself received the following poem from her now-IEI-husband on their second date.