does a person seek out a third person with ease

and if you are a VIP (that is the key)!

If you are wanting an escort to visit you and your SO, a lady who is "really bi", and, or, who advertises her availability to couples will do well for you.

If you want 2 SP's at the same time, search for ladies "Willing to bring a 2nd provider, and, or, advertises this service.

If you want to visit an SP with a male friend, search for a lady who will see "more than one guy at a time".

No matter the combination, a threesoame will cost extra, and a strong TER review profile, I mean you not the ladies, will do you well in making this experience happen.