Dating advice: boundaries and trama

After years of abuse and trauma stemming from my ex-husbands porn addiction and betrayal I am completely repulsed and against porn in any form. I am ready to start dating and don’t know how to ask or make it clear how I feel about it and make sure they feel similarly to how I do. For me, if my new partner were to watch porn I wouldn’t continue the relationship. How would I go about bringing up the topic when first meeting? How do I make it clear what my boundary is?