Maybe "all of the above" at one point or another. Notice that she was doing cocain before he started. She was either getting it from somewhere, or he was getting it for her. Also, the story doesn't make it sound like she was an unwilling participant in the "three-way sex search".
Why not? She was getting a double order of sausage, the inverse situation of Every Man's Fantasy. It definitely sounds like she was a little kinky herself . . . Janice Soprano springs to mind.