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It is and always has been No.
In fact, there are ads and personals posted by people on every continent including loads of swinger couples!
More and more.
You might be surprised how many cuckold husbands want to watch their lady getting it on with another man.
And that is especially true in most cities.
Agencies are good in the sense that you can have your choice of a number of girls and only have to dial a number to get one sent to your room fairly quickly.
I am bi-curious as well, so if you can bring a another lady to the party that would fulfill all of my fantasies at once!