Personally, I wouldn't risk it. You will then considered of low moral turpitude, and wont be allowed in again, if you read the ESTA or I-94W forms.
You are also in an unfamiliar country, with a selection of stupid laws, where wire taps and scams are common place, and a range of law enforcement agencies so you dont know who's who.
On a previous visit some years back, I managed to pull a waitress, and she stayed over at my hotel after her shift, did everything except anal, and I offered her a gift of $200 for her time. On a recent trip there are small bars, sometimes proliferated by rednecks from backward states (ie: South Dakota), and the barmaids seemed to have a uniform of denim shorts, so if you are feeling lucky....?
Given that the US is one of the countries biggest producers of porn to which a blind eye is turned, probably dues to the backhanders, their stance on prostitution is parochial in comparison.
Las Vegas carries no interest for me, Nevada is the biggest scam state going, and there is nothing about it that appeals in the slightest.
Now, if you want fun and a smoke, dont forget that in Colorado cannabis is now legal.