Adult entertainment is alive and well in Las Vegas, so leave the kids at home and let loose on the strip. Las Vegas is usually the top choice for industry gatherings, including the adult entertainment industry. The top expo is the AVN Adult Entertainment Expo -- otherwise known as “the porn convention”. It takes places every year at the Hard Rock, which, to be fair, feels like a porn convention pretty much every night. Topless Vegas. Las Vegas is home to the world's largest gentlemen's club (Sapphire), plus a couple dozen other topless joints and a half-dozen all-nude clubs.