The seven deadly sins of duos. [Feel free to add your own]

1. The “guest cameo appearance”. One girl (or girls) appears for a few minutes, and then goes away.
2. Girls talking among themselves in a language not understood by the client.
3. Playing game on mobile phone to pass time. (Bad)
4. One girl doing nothing, just hanging around looking bored. (Not as bad, but not good)
5. Two girls in a multi-girl experience really getting it on, (so far, so good) and then leaving to complete the action (or leaving for some reason) elsewhere.
6. No girl-on girl-action or the two girls don’t work together.
7. One girl appears to be “an apprentice” and is not really taking part, but is being taught her trade by the other girl, at the client’s time and expense.