It is illegal in forty-nine states, and buying is the part that gets prosecuted
Everything most Europeans assume about this is wrong in the United States, and the direction of the error is the dangerous one. Prostitution is a crime in every state except Nevada. Buying is an offence, not only selling, and in most states soliciting on its own is enough to be charged. Police departments in most large American cities run reverse stings aimed specifically at buyers, and the arrest is public record.
Nevada is the exception people have heard of and it is narrower than the reputation suggests. It is legal only inside licensed brothels, only in certain rural counties, and state law bars them in any county with more than 700,000 people. That excludes Clark County, which is Las Vegas. Everything in Las Vegas is illegal, including the part the whole world assumes is not.
The federal layer, which has no European equivalent
In 2018 Congress passed FOSTA-SESTA, which created a federal crime of owning, managing or operating a website with the intent to promote or facilitate prostitution. Nothing like it exists in Europe. It is why the American advertising landscape collapsed overnight in 2018 and why what replaced it is smaller, more scattered and considerably less accountable than what came before.
The practical consequence for anyone reading an American advert is that the platforms with the most to lose left, and what remains has the least. There is no register, no licence and no authority anywhere in the country to check with, and unlike Europe there is no legal space in which one could exist.
What this page is and is not
This is not legal advice and it is not an encouragement to do anything. It is a description of the rules, written because the most common American mistake is assuming the European ones apply. If you are in the United States, the honest summary is that the law is against you in a way it is not against a visitor in Berlin or Amsterdam, and no website changes that.
What this network does everywhere it operates is narrow and worth stating plainly: every profile has been through a face and body video review, watched by a person and matched against the gallery, before publication. That addresses one failure - the woman at the door not being the woman in the photographs. It has nothing to say about the legal position, which in the United States is the larger issue by some distance.