look here:
http://www.eccie.net/showthread.php?t=1521653
Most of the large casino/hotels have 1000s of rooms. They know people are fucking in the rooms. They don't care as long as you're not trying to pick up guys on the casino floor (the Vegas version of a streetwalker is casino girls that aggressively go after lonely guys in the casino) or stealing from their customers.
Here's what might be good to know: If it gets busy, some hotel/casinos will have security posted at the elevator banks to check room keys. While some people don't like this, I'm personally of the opinion that it does keep the riff raff away from the hallways that aren't suppose to be there (not always but it keeps the stupid ones away). It does force meeting in the public place or doing some goofy things like leaving room keys hidden (like in the gift shop). There's a minority of places that require a working room key to get the elevator buttons to work (or to get to certain premium floors).
Most guys/couples visiting will want outcall. Some locals prefer outcall. Either have a rental car to do those outcalls (with a good GPS/phone app) or get Uber and Lyft as getting a cab to show up away from the strip is like watching paint dry. Always a good idea to use your room as an incall for the people who want it.
Enjoy your trip. Don't expect to work a lot. Best way to work a lot is to hit up your prior customers and ask them to see you in Vegas while you're visiting.