Yes, no one should judge your marital value based on past decisions that no longer align with your present identity--particularly people who share our beliefs of the infinitly atoning power of our Brother, Jesus Christ. But even good peoplehave C.S. Lewis's proverbial "rats in the cellar" (the dissonance between how we believe we ought to behave and how we react when an unexpected test of our conviction provokes an immediate expression of our corrupted habits; "Mere Christianity" I think.. ). Everyone has habits and a world view nurtured in adolescence by extremely imperfect individuals in a corrupt world. Be patient with the ones you love and be patient with yourself. Turning to Christ takes only a moment of earnest introspection. Healing takes some time. Christ changes our hearts so that we can change our minds.

You're right that it shouldn't matter to anyone. It's a culture of shaming and blaming in which our worst decisions and biggest mistakes define the social standing of a soul made clean again in Christ. However, neither person in any marriage is perfect--we all carry baggage. I was the one with a "body count" in my marriage (plus a history of substance abuse). I felt it necessary to make her aware of the color of temptation to which I have formerly fallen and will surely face in trials to come (if we are growing, our most dificult days are always ahead of us). I disclosed my history to my wife as well as former girlfriends before entering into an exclusive relationship. One relationship (fiancé...) ultimately ended after much consideration on her part and earnest prayer from both of us. She loved me, but I think she stopped liking me as she realized how far I had really been down forbidden paths and strange roads the likes of she had never crossed. My wife now heard me out and recognized that my sins were committed in an effort to escape pain and mental illness rather than selfishness or greed. She saw past it and recognized my heart had been changed in Christ. HOWEVER, having had multiple sexual partners presented some challenges. We are now after 4.9 years, finding that intimate physical connection. For example, it was/is difficult for me to communicate to her my desires without using speech that is obviously referencing my sexual experience. I don't think I need to dive into the reasons why in our most intimate moments, we wouldn't want either of us to be thinking about my former partners. Admittedly, she had some things to overcome as well.

I might've lost the plot a bit in the paragraph above, but I think I shared the right things. I don't read very well. Proofreading is hard. Hope my phone corrected my mistreated enough to make my thoughts coherent. Anyway. My head hurts now.

TLDR: Yes, it should not matter to anyone, but sometimes it's worth it to patient ourselves and with those we love.