Disclaimer: This question does not pertain to me or anyone I know. I am NOT condoning or encouraging prostitution, illegal or otherwise. Just genuinely curious what would happen because I sometimes think of random questions like this. 
Would previous employment as a legal sex worker be grounds for inadmission to the United States for immigration purposes?
To clarify, this is NOT concerning someone who worked illegally in the sex industry - it’s pretty obvious that falls under criminal activity and there’s no way such a person would be allowed to migrate to the U.S. unless they managed to get a refugee visa in a case of being a victim of sex trafficking or something like that. I’m talking about a prospective migrant who comes from a country where prostitution is legal and regulated (eg Germany, Netherlands, Australia, etc.) and they were employed legally as a sex worker in that country.
Obviously, they would have to solemnly swear or prove they are not going to do the same in the U.S. (except perhaps if they are moving to a place in Nevada where prostitution is legal?), so let’s say this hypothetical person does have other qualifications and a job offer in a field that is legal in the U.S. and otherwise meets all other qualifications for immigration. Could they be turned down for their prior employment in the sex industry, even if this was legal in their home country? Has this situation ever come up? Is there a statute of limitations on this - e.g. if their employment in the sex industry was many years ago and they have no intention of returning to it?
And related question: would a job offer from a legal brothel in Nevada be acceptable for immigration for employment purposes?
Any immigration lawyers or people who work for USCIS around to give an answer or educated opinion on what might be a likely result if such a situation were ever to come up?