An adult movie theater is a place where people can go to watch special movies that are specifically made for adults. These movies often show people doing things that are not appropriate for children to see, so only grownups are allowed to watch them.
Just like when you go to a regular movie theater, you buy a ticket and then go inside to sit down and watch the movie. But in an adult movie theater, there may be some different rules. For example, you might have to be a certain age to go in or you might not be allowed to bring food or drinks inside.
The movies that you can watch in an adult movie theater are usually about things like love, romance or things that grownups do together. Some people like going to these theaters because they can be around other people who enjoy the same types of movies. However, some people might not feel comfortable watching these movies in public and prefer to watch them at home instead.
Overall, an adult movie theater is a special kind of movie theater where only adults can watch movies that are meant for grown-ups.