Cats keep rubbing people’s legs to express these things:

1. Rubbing people’s legs is a way of social interaction between cats. They use cheeks and body rubs to exchange information and establish close relationships. . At the same time, cats' facial glands release a special scent substance to mark their territory and recognize other members.

2. Rubbing against the human leg may also be a cat's behavior to express closeness and dependence. Cats may purr while rubbing, which is their way of expressing contentment and joy.