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If this phenomenon is female, it is usually urethritis. If you are a man, it is usually prostatitis.
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She told you to drink more water, didn't she ask you what you did before you urinated less.
Your question is not sufficient, I can't give you an answer.
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If it's all right, it's nervoic urinary frequency, which is more common.
Eating something unclean, or catching a cold.
If the erection is too long, the urethra is congested and a little inflamed, drink more water and urinate more, rest for a few days, and abstain from sex during the rest.
That's a bad habit, you don't have to pee so many times in the future, and you will change this bad habit if you pee on time.
This condition may be unclean bowel movements, which is directly related to eating habits, but if it is frequent, you should see a doctor.
Drink plenty of water and eat plenty of fruits to regulate your stomach.