system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 why do humans and some animals often rub their cheeks on stuff they "like" or see as "cute"

Or simply things they "love"

Edit : thx for Nice answers! The five year old was able to learn something!
gpt
We're marking our territory!

This behavior is from way way back when our animal ancestors had scent glands on their cheeks.  Rubbing your cheek against something put your scent on it, so other animals would know this was YOUR thing.  Animals like cats still have these glands, which is why if your cat loves you, it will probably rub its face all over you every once in a while, to tell all the other cats in the neighborhood that you're its human and nobody else better come ask you for pettings.