In several cases observed by psychologists around the globe, hugs are often used to solidify relationships in both sexual and platonic cases and often lead to further physical encounters.
A hug is very good for people. Hugging can release a chemical called Oxytocin, which helps make a person feel less stressed. It also helps a person's immune system, and makes them feel less pain. Hugs can even help a person stay calm in a stressful situation.
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Hug Facts for Kids. Kiddle Encyclopedia.