I didn't know prostitution was legal in only some places in Nevada.

While "paying for sex" is illegal in Las Vegas, "having sex" isn't.

The usual arrangement is that you must call a location outside the county, and provide a credit card number. The payment is thus not made in Las Vegas. When the payment is verified (which takes less than an hour) your "date," who likely is already in your hotel, will be called to tell her (assuming that's your preference?) that it's okay to meet you.

I don't know if this "custom" is observed elsewhere in Nevada where there are restrictions; but it's been frequently reported by "travel agents" for Las Vegas and a couple of other casino locations.

You must be careful though, about giving her(?) a tip in person. There appear to be additional "conventional behaviors" associated with tipping that are less fully defined.

John