Why is the penis glans super sensitive after orgasm

Symptoms
#1

I’m talking about a normal penis that just orgasmed. What makes it so sensitive afterwards. Do we know what brain chemicals cause this?

I’m asking because if we know this it could help in figuring out how to solve the genital numbness problem

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#2

I have a weird symptom, after orgasm, my pennis is not sensible like before. If i drink alcohol this improves.
Probably prolactin or something like that, idk

#3

Same here. Don’t have that sensitivity after orgasm like I used to.