[NSFW] In a threesome with benefits, can you describe the other two people you'd want to be with?

Let’s day an aging billionaire roué just wants to watch. He wants to recruit you and any two partners you select. He has a palatial home set up for his threesome to live in. Of course, it’s equipped with one-way mirrors so your benefactor can enjoy the proceedings without intruding directly in the action.

Each partner in the triad will get $1 million a year for as many years as you all stay together and have three-way sex at least 3 days a week—with excused absences allowed for necessary travel or health issues. What types of partners would you want? What gender/s? Why? What activities would fit in your threesome, and which would be out-of bounds?