Post sex/orgasm we produce a chemical called prolactin that works as a dopamine inhibitor & gives us feelings of satisfaction.
[https://sites.tufts.edu/emotiononthebrain/2014/11/18/postcoital-neurochemistry-the-blues-and-the-highs/](https://sites.tufts.edu/emotiononthebrain/2014/11/18/postcoital-neurochemistry-the-blues-and-the-highs/)
Here is an article explaining it it more detail
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