Found this while doing some research on this board:

1. Flee from avarice like a noxious plague, and embrace its opposite.

2. You must keep yourself chaste for your beloved's sake.

3. You must not deliberately try to break up a love affair between a woman suitably joined to another man.

4. Take care not to choose for your love a person whom a natural sense of shame would prohibit you from marrying.

5. At all costs take care to avoid lies.

6. Do not have many people in the secret of your love.

7. Being obedient in all things to the commands of ladies, always study to be enrolled in the service of love.

8. When fulfilling and receiving the pleasures of love, always let modesty be present.

9. Speak no evil.

10. Never publicly expose lovers.

11. Show yourself in all things polite and courteous.

12. When you are engaging in the pleasures of love, do not exceed the desires of your lover.

This was a collection of precepts translated from the Latin by Andreas Capellanus in the 12th century.