Half of /fit/ is overrun with them. If I had to I would ascribe it to delusions or groups like Exodus Cry (who allegedly are responsible for the recent pornhubcaust).

Nevertheless, some anon posted a nice scientific screencap, which I unfortunately failed to save. It said something along the lines of „the testosterone spike after eight days might be spike only because androgen receptors go up, which clears the test“ or something along those lines. Does not make a lot of sense I admit.

What is the 2021 status of research?

As I see it the lines of reasoning are twofold: Something to do with dopamine and something about prolactin and testosterone.

Any experts present who can elaborate or provide relevant links?

Pic kinda related