In Nevada, the only U.S. state with legal brothels and where tourists frequent "Sin City" Las Vegas--"The new law defines sex trafficking, stiffens criminal penalties, provides tools for victims and law enforcement officers *and includes customers of trafficked persons in the same criminal class as the traffickers in some cases*."

http://www.sfgate.com/news/crime/article/Governor-signs-major-anti-sex-trafficking-bill-4584789.php