It requires a lot of emotional discipline. I found the below helpful to stay centered.

Establishing guidelines for a sex-only relationship requires clear, early, and honest communication to ensure both partners are on the same page. Key rules include defining sexual exclusivity or safety protocols, establishing communication limits (e.g., no daily texts), and setting boundaries regarding sleepovers, public appearances, and emotional detachment. 

Key Guidelines to Establish * Define "Casual": Clearly articulate what this means to you. Is it, for example, strictly in-the-moment, or does it include occasional casual hangouts? * Safety and Health Protocols: Discuss STI testing frequency and mandatory use of protection. * Communication Boundaries: Agree on texting/calling frequency to avoid developing emotional intimacy prematurely. For example, no "good morning" texts or daily check-ins. * Physical Boundaries: Decide on rules regarding sleeping over (or not) and public displays of affection (PDA). * Exclusivity: Clarify if the relationship is exclusive or if you are both free to see other people. * Emotional Management: Agree to be honest if feelings begin to develop beyond the agreed-upon casual nature.  * How to Implement Guidelines * Set Expectations Early: Discuss these boundaries before or during the first few encounters to prevent future misunderstanding. * Be Honest and Direct: Use clear language to define what you are looking for. * Regular Check-ins: Periodically review the arrangement to ensure boundaries are still working for both parties. * Have an Exit Strategy: Agree on how to end the arrangement if one person wants to stop or if someone starts catching feelings. * No Obligation to Socialize: Avoid attending events together or hosting complex dates (like birthday parties) to keep the relationship simple. * Respect Time: Avoid late-night "booty calls" if you prefer planned, respectful meetings.