Codependents of Sex Addicts (COSA)

What Is COSA?

COSA is a free, anonymous 12-step fellowship for people whose lives have been hurt by someone else’s compulsive sexual behavior. The “someone else” is usually a partner or spouse, but COSA is also for parents, adult children, and friends. If a loved one’s sexual behavior has shaken your sense of reality, your trust, or your peace, this is a room built for you.

Here’s the part that surprises a lot of newcomers. COSA is not a place to fix, monitor, or save the person whose behavior brought you here. It’s where you tend to your recovery, your healing, your boundaries, and your steadiness, whatever the other person chooses to do.

That shift, from managing them to caring for yourself, is the heart of the program.

Who COSA Is For

COSA is for anyone whose life has been affected by another person’s compulsive sexual behavior. It began in 1980 for people whose lives were turned upside down by a partner’s behavior, and the fellowship has stayed true to that. The most common members are partners and spouses, but the door is wider than that. Parents, adult children, and close friends all come to COSA when someone they love is acting out sexually in ways that have spilled into their own lives.

You don’t need a label to belong. You don’t have to be sure the other person is an “addict,” and you don’t have to know whether your relationship will survive. If their behavior has left you anxious, distrustful, obsessing over what’s real, or quietly falling apart while you hold everything together, you fit.

The pain that brings people to COSA is real, and it deserves care of its own.

How COSA Works

COSA gives people a structure and a community for finding their footing again after a loved one’s sexual behavior has knocked it out from under them. A few parts do most of the work.

Your Own Recovery Comes First

This is the idea that turns everything around. Trying to control, cure, or out-love another person’s compulsive behavior often leaves you more exhausted and more lost. So COSA gently moves the focus back to the one life you can actually tend.

Members learn to step out of the role of detective, fixer, or warden and start asking a different question: what do I need to heal? It isn’t giving up on the other person. It’s stopping the bleeding in your own life.

The 12 Steps

The 12 steps are the backbone of the program, the same steps AA and Al-Anon have used for decades, adapted for those affected by compulsive sexual behavior.

The first one sets the tone: members admit they’re powerless over someone else’s sexual behavior, and that trying to manage it had made their own lives unmanageable. From there the steps walk a person, at their own pace and usually with a sponsor, toward releasing what they can’t control and rebuilding a self that got lost along the way.

Boundaries

A lot of people arrive at COSA with no idea where they end and the other person’s behavior begins. The program helps members figure out their own limits and learn to hold them, not as punishment or as a way to force a change, but as a way to stay safe and whole. Boundaries in COSA are about protecting your own peace, whatever the other person decides to do.

Sponsorship

A sponsor is a member with more time in recovery who agrees to walk you through the steps and be there when things get hard. It isn’t therapy, and it isn’t someone telling you what to do about your relationship. It’s one person who has lived this helping another find their way. For many members, that steady, been-there relationship is where a lot of the healing actually happens.

Meetings and Anonymity

Meetings are where the fellowship lives. They’re free, and they run in person, over the phone, and online. People share openly about the fear, anger, and grief they’re carrying, and about what’s helping.

Anonymity is taken seriously. Members use first names only, and what’s said in a meeting stays in the meeting. That privacy is what makes it safe to finally say the things you’ve been holding alone.

Does COSA Help?

The model COSA is built on has strong evidence behind it, even though COSA keeps no statistics on itself. Anonymity makes that kind of tracking hard by design, so there’s no single number to point to. What we can say is grounded in how this kind of program has been studied more broadly.

Research on Alcoholics Anonymous and similar 12-step programs found them at least as effective as professional treatments such as cognitive behavioral therapy for keeping people in recovery, with benefits that held up over years ^[1]. That evidence is best established for people recovering from alcohol, and being affected by a loved one’s behavior is a different situation, so the research doesn’t transfer one-to-one. What carries over is the engine: peer support, structure, sponsorship, and a shared framework, applied here to the very real harm of loving someone with compulsive sexual behavior.

In practice, the members who get the most out of COSA tend to be the ones who keep showing up, get a sponsor, and work the steps rather than just attending. Many pair COSA with a therapist who understands betrayal and relationships, and that combination often does more than either one alone.

COSA Compared with S-Anon

If you’ve been reading about support for partners, you’ve probably run into S-Anon too, and it’s easy to mix them up. Both are 12-step fellowships for people affected by another’s compulsive sexual behavior, and both are modeled on Al-Anon. The differences are small and mostly about history and culture rather than purpose. Many people visit both and stay with whichever room feels like home.

There’s no wrong door. If you’re not sure which fits, the practical move is to try a meeting of each and see where you breathe easier. You can look into the sister fellowship for affected loved ones, S-Anon →.

And if the word that keeps echoing for you is betrayal, you’re not imagining it. The discovery of a loved one’s compulsive sexual behavior can land like a genuine trauma, with real grief and real symptoms. It can help to understand betrayal trauma and how partners heal → while you find your footing in a fellowship.

How to Find a COSA Meeting and Get Started

Getting started is simpler than it feels from the outside. COSA’s official website lists meetings you can search, and it runs a full schedule of phone and online meetings you can join from anywhere, often the same day.

Many people start with an online or phone meeting so they can listen first, with no pressure to speak. You don’t have to introduce yourself, share your story, or commit to anything. You can just show up and let the room hold you for an hour.

If you’d like a professional in your corner too, that’s a strong combination, and the right therapist can work alongside the fellowship. You can find treatment and recovery support that fit → when you’re ready.

Written by

Jessica Miller

Editorial Director

Jessica Miller is the Editorial Director of Addiction Help. Jessica graduated from the University of South Florida (USF) with an English degree and combines her writing expertise and passion for helping others to deliver reliable information to those impacted by addiction. Informed by her personal journey to recovery and support of loved ones in sobriety, Jessica's empathetic and authentic approach resonates deeply with the Addiction Help community.

Reviewed by

• Fact-Checked
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Kent S. Hoffman, D.O.

Co-Founder & Chief Medical Officer

Kent S. Hoffman, D.O. has been an expert in addiction medicine for more than 15 years. In addition to managing a successful family medical practice, Dr. Hoffman is board certified in addiction medicine by the American Osteopathic Academy of Addiction Medicine (AOAAM). Dr. Hoffman has successfully treated hundreds of patients battling addiction. Dr. Hoffman is the Co-Founder and Chief Medical Officer of AddictionHelp.com and ensures the website’s medical content and messaging quality.