It looks like I'm going to be in Vegas for a short business trip.  I'll probably be staying at the Venetian.  I saw Jaydalees post on 5/1 on security.  Is being at the Venetian a problem?  

There is security at the elevators 24hrs just meet your guest downstairs and go up together.
Or you could meet somewhere in the hotel hand your guest your spare key and go up separate.

If you are discreet there's no issue any place.