Read what Wikipedia, the web's most extensive encyclopedia, writes about prostitution in Nevada. Wikipedia is well respected, but it's known to have many facts wrong so don't take everything for grantad they write about prostitution in the USA.
Different states of the United States have other laws. That's why brothels and prostitution are legal in Nevada, full service massage parlors are tolerated in some states and a couple of US states frown upon prostitution. The American escort scene is huge and unique.