Candaulism is a sexual practice in which an individual derives pleasure from observing or being aware of their partner having sexual relations with another person. Each couple may establish their own rules based on their preferences, boundaries, and needs. Here are some general guidelines that some couples choose to apply when engaging in candaulism:

1. Open communication: Establish honest and transparent communication between partners before engaging in candaulism. Discuss your expectations, boundaries, and emotions related to the practice.

2. Mutual consent: All participants must voluntarily consent to the practice and respect each other's boundaries.

3. Establish boundaries: Each partner should clearly express what is acceptable and what is not within the context of the practice. Boundaries may involve physical, emotional, or relational aspects.

4. Privacy: Respect and protect the confidentiality of those involved. Do not share personal information or details without consent.

5. Practice safe sex: Use condoms and/or other protective methods to reduce the risk of sexually transmitted infections (STIs) and unintended pregnancies.

6. Emphasis on emotion and relationship: Candaulism should be practiced mindfully to enhance the emotional intimacy and relationship between partners rather than causing problems or tensions.

7. Regular check-ins: Periodically discuss your experiences and feelings to ensure both partners remain comfortable with the practice.

Please note that every couple is unique, and what works for one may not work for another. The key is to maintain open communication and to listen to each other's needs and boundaries.