And wouldn't being a high end call girl be illegal? They may make a lot of money, but they can still be arrested for it. As odd as it is, and as creepy as it may appear to many, at least being one of three women living with your 'boyfriend' is not illegal.
The only legal prostitution in the US is in Nevada, and it's not even legal in Clark County, which is where Vegas is. The girls at the brothels in Nevada have stricter rules than the Girls Next Door girls. They have to live on the ranch. They only get to leave for a few hours each week. And they do not live glamorous jetsetting lives. Those girls would probably kill for a chance at $4000 a month, plus living in a mansion, and getting a downpayment on a car, and travelling all over the world on someone else's dime