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How to manage urges?
Just don't think about it. Don't stare girl's features on road. Don't search on Google or YouTube. If then also I get any negative thought I start residing tables of 12,13,14.... You can do something like that try to revise something which is important for your exam or job.
Porn or masturbation urges
Stop edging to pictures, videos. Urges cannot be managed unfortunately. They can only be replaced with something else in my experience. Controlling them will only lead you to relapse multiple times.