Okay kiddo, have you ever heard of people called sex workers? They are people who get paid money for doing sexual things with other people, like kissing or having sex. Sometimes people don't think it's very nice or respectful to do that kind of work, so sex worker movements are groups of people who want to make sure that sex workers are treated fairly and with respect.
These movements help sex workers by talking to other people about why it's important to treat them with kindness, and by making sure that the laws in different places are fair and don't punish sex workers just for doing their job. They also make sure that sex workers have access to things like healthcare and safety, so that they can do their job as safely as possible.
The people in sex worker movements believe that everyone should be able to choose what kind of work they want to do, including sex work. They work to make sure that sex workers are not judged or discriminated against because of their job, and that they have the same rights as everyone else.