I have 2 questions
1: what is flatline and how it is , how much it takes to pass
2: i heard on flat line your dick might stop working , is it true ? Please tell me about it
Hey man, dick it never stop working 
if your brain doesn’t have no sex temptation, dick can stay flat for long time, it’s true in the morning it raise, but that is a sign of health. Don’t take it for a fact what I said, is just an opinion.
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In the flatline you just get bad urges you feel tired and your dick shrinks for awhile don’t fall for it usually lasts 3 days max but you’ll feel great when it’s over
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Also when flat line comes depends on how much you used to watch porn
I get it around 2nd week but for some people it comes only after 3 weeks or even months