Poly compatibility is not just about attraction. Two people can have incredible chemistry and still be structurally incompatible if they want fundamentally different things from their relationship. The conversations below are worth having early, before assumptions harden into conflicts.
Relationship structure. Are you hierarchical or non-hierarchical? Is there a primary partnership? Do you want a nesting partner? Are you looking for something that could grow into that, or are you specifically looking for connections that stay independent? These are not right-or-wrong questions, but mismatches here cause the most damage because people often assume their default is universal.
Time and availability. How much time do you realistically have for a new connection? Are there standing date nights with existing partners? Are weekends spoken for? Be honest about this - offering time you do not actually have sets everyone up for disappointment.
Disclosure and transparency. What do your existing partners know about new connections? What do you share and what stays private? Do your partners want to know names, details, or just that someone exists? Does your potential new partner have the same expectations about what gets shared about them?
Metamour relationships. What kind of relationship do you want (or not want) with your partner's other partners? Kitchen table poly where everyone hangs out together? Parallel where you know they exist but do not interact? Something in between? There is no correct answer, but incompatible expectations here create ongoing tension.
Sexual health and boundaries. Testing frequency, barrier use, what changes when a new partner enters the picture. This is not optional and it is not a one-time conversation. As the network changes, these agreements need revisiting.
Emotional bandwidth. Are you in a place where you can actually support a new connection emotionally? New relationship energy is real and it can make you overcommit. Be realistic about whether you have the capacity for another relationship or whether you are filling a gap that exists in your current ones.
Conflict and communication. How do you handle jealousy? What happens when schedules conflict? Who do you go to when something is hard - your partner, a friend, a therapist? Poly relationships do not have fewer conflicts than monogamous ones. They have different ones, and the people who navigate them well are the ones who have talked about how they handle difficulty before they are in the middle of it.
Long-term vision. Do you want to live together eventually? Have children? Share finances? Or is this connection explicitly not heading in that direction? Both are fine, but both people need to know.
Surfacing all of this in one conversation is a lot. Some people use structured tools to make it easier - shared documents, compatibility questionnaires, or apps like Lykewise where you can both answer independently and see where you align without one person having to bring up every topic. However you do it, the goal is the same: find out where you match and where you do not before you are emotionally invested in a particular outcome.