What is the country of Vegas?
Nevada, United States
Yes, Las Vegas weddings are internationally recognized or legal. In order to prove you were married in Las Vegas you will need to obtain a Certified Abstract of Marriage Certificate. In addition, many countries require an Apostille. Regulations vary from country to country. It is best to check with your local officials in regards to what paperwork is required.
Las Vegas is probably where the most gambling, prostitution, drunkenness, and partying go on in this country. All of which are considered sins. Answer: Las Vegas is no different than many places on Earth. There is no real definition of sinful except in the context of specific set of religious beliefs. The Las Vegas advertising works on making it seem "safely sinful" to draw in tourists.