For example why does a kiss feel different than an orgasm or satisfying a food craving if they’re all feel good things?
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The cravings are being caused by certain chemicals triggering reactions in certain parts of the brain. Something like a kiss or orgasm is going to be triggered from different chemicals then say a food craving. Food cravings are strongly regulated by insulin for example and when insulin makes its way to the brain (or the lack of it) certain cravings can be triggered by that specific balance of chemicals.
Evolutionarily speaking, and stick with me, kissing and grooming has been deep rooted in the earliest of animals and we have evolved to enjoy being groomed and smelling and licking each other because it lets us know about eahcothers health, diet and other related behaviors. Licking someones mouth can tell you a LOT about that person. So, we have evolved to “enjoy” or “crave” things that keep us alive but those cravings are caused by different chemicals in different combinations of the brain so they feel differently.
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