There’s a lot of [reasons](https://www.healthline.com/health/hugging-benefits#4.-Hugs-can-make-you-happier)! The thing I think you’re talking about is called oxytocin or the “cuddle/happy hormone” This is a hormone that tells your brain you are content and safe and one of the ways to make your brain release it is through touch. This can be hugs, hand holding, and even sex or birth.
It’s basically because hugs make your body release the health juice you use to magically heal in video games
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