Ah… the age old what causes Deca Dick discussion.
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Some say it’s prolactin. Use caber they say. IMO rarely the cause and usual moderate doses of Nandrolone rarely cause prolactin to be exceedingly high
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Some say it’s DHN. Nandrolone causes displacement of DHT isn’t the penile tissue with DHN. Use higher test they say or masteron. IMO maybe or maybe partially.
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Some say it’s neurological. Nandrolone messes with your rewards pathways etc. It can cause a disconnected feeling from your libido and penile sensations. IMO highly likely a cause for most and possibly a mix with 2 above.
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Some says it’s your E2. Nandrolone aromatizes a fifth the rate of test. Some will overuse an AI not understanding their compounds. Tanking your E2 is crushing to libido. If this is your scenario it’s also a likely cause.
Summary… could be any or a combo of the above. Not to much effort in the scientific community diagnosing the causes since it’s a black market issue.