There are several potential reasons why your cat may lick plastic bags:

1. Taste: Cats have a keen sense of taste and may be attracted to the flavors or scents present on plastic bags. If the bag has come into contact with food or other substances that have a strong smell or taste, your cat may lick it as a result.
2. Textural curiosity: Cats are known for their love of textures and may lick plastic bags as a way of exploring and interacting with them. The smooth, shiny surface of a plastic bag may be especially appealing to a cat’s sense of touch.
3. Attention seeking: If your cat licks plastic bags while you are nearby, it may be a way of trying to get your attention. Cats are social animals and may lick objects as a way of seeking interaction with their owners.
4. Obsessive behavior: In some cases, excessive licking of objects may be a sign of obsessive-compulsive disorder (OCD) in cats. If your cat’s licking is excessive or appears to be uncontrolled, it may be a good idea to consult with a veterinarian or a professional animal behaviorist.
5. Medical issues: Licking can also be a sign of an underlying medical issue, such as allergies or a skin condition. If your cat’s licking is accompanied by other unusual behaviors or symptoms, it is important to have them checked out by a veterinarian.

Overall, the reasons for your cat licking plastic bags may be benign or may indicate a more serious issue. If you are concerned about your cat’s licking behavior, it is important to consult with a veterinarian or a professional animal behaviorist for a proper evaluation and guidance.