When you say "ran a train". You mean a threesome or they had a gang of dudes in there while they watched/participated?
Him and his wife had her as a fukk toy, to put in raw terms. I doubt it was a situation where Angelina simply invited another woman to share Brad with.
At that level, regular sex does nothing for them. If it was a physical lust kind of thing, they could've easily found a Taraji (looks wise) half the age and twice the body. They get off on dominance and power.
This was a "colleague" that was tryna move up and before they handed her the keys, they needed a memory or a kind of leverage that will always remind her where she stands with them.