system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are actions like kissing, hugging, holding hands specifically considered displays of affection? Specifically in terms of psychology or biology.
gpt
Hugging, holding hands, and kissing releases chemicals in our brain that are used for feel-good, bonding, and trust. Building these things are important for our survival and reproduction, because these things ensure that both the mom and dad will be together to take care of their offspring.