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youdontknowme Some guys do it 5 times a day and then cannot get it up if they find a willing partner. Those are the people for whom masturbation is a problem, and some people try to quit cold turkey like a smoker trying to stop smoking. Though seeking out a therapist may be a more productive idea than locking it up and throwing away the key, especially since unresolved arousal can lead to other forms of problematic behavior.
I would definitely classify masturbation as a potentially addictive behaviour, but I've not been convinced by arguments that such addictions always require therapy. People may smoke and over-eat because they are fruitlessly trying to fill gaps in their lives, but many also do these things simply because they feel nice.
From what I saw NoFap seems to be generally against the idea of chastity belts, preferring that converts to the path make mental changes that they hope will later be expressed as changes in behaviour. From my point of view, as someone who does feel they were addicted to masturbation, the chastity belt serves the same purpose as a lock on the cookie jar, or leaving the cigarettes in the shops. In short, I prefer to use a barrier method!
Am interested in the idea of unresolved arousal leading to problems, but would balance it with the idea that resolved arousal can re-enforce paraphilias.