The word can be confusing, so let us start plainly. A cuckquean is a woman who finds erotic or emotional satisfaction connected to her partner being sexually or romantically involved with another woman, with everyone's knowledge and agreement. It is the feminine counterpart to the much better known cuckold dynamic. And while the male version has drifted into the cultural mainstream, the female one has stayed in the shadows, which is most of why it feels so lonely to the people who discover it in themselves.
Consent is what separates it from betrayal
Everything rests on one word: consent, meaning enthusiastic, informed, ongoing, and freely revocable by anyone at any time. Without it, this is not the cuckquean lifestyle at all. It is just cheating. With it, the dynamic becomes something built together, deliberately, that either person can pause or stop whenever they need to. If you remember one thing, remember that the freedom to stop is exactly what makes it safe to begin.
It is a spectrum, not a single act
People imagine one dramatic scene, but in practice this is a wide spectrum. On the gentle end it lives entirely in fantasy and conversation and never involves anyone else, which is a complete and happy destination for many couples. In the middle are degrees of real involvement. You get to choose your point on the spectrum, move along it slowly, and move back whenever you like. Staying in fantasy forever is not failing at anything.
What it is not
It is not self-hatred dressed up as a kink, and it is not a sign that a woman does not value herself. For most people who feel it, the psychology runs the other way. It tends to come from security, trust, and a generous pleasure in a partner's pleasure, a feeling that even has a name, compersion. It is also not simply the cuckold dynamic reversed. Its emotional flavor is usually tenderer and warmer than the humiliation-heavy version the internet led you to expect.
If this describes something in you, the most useful first step is not to act but to understand yourself: what actually draws you, what you fear, and what a good version would feel like the morning after. That inner work is yours to do now, whether or not a partner is anywhere in the picture.