Hello dear , I am 27 years old and my panis is...

Dear Customer
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Does masturbation may lead to penis weakness ?
its unlikely to masturbation to cause a perminant sexual weakness , masturbation addiction may lead to that besides other enviromental factors 
What are the other possible causes of your medical condition ?
1. stress 
2. anxeity 
3. depression
4. general weakness
5. physical weakness
6. unhealthy life style such as : unhealthy diet , smoking , durgs , alcohol 
7. some drugs side effects 
What to do next to treat your medical condition ?
1. avoid masturbation for while ( 2 weeks ) , and when you back to masturbate , follow the healthy range which is 2-3 times a week at most 
2. give up bad habits such as : smoking , alcohol , drugs 
3. make sure you are not taking any medication that may effect on your sexual ability 
4. have a healthy diet , avoid stress , exercise 
5. eat more helpful food for sexual ability such as : dark chocolete , eggs , carrot , walnut , almond ,beans and mashrooms 
6. if you  followed those steps and you still have the same medical issue , we advise you to visit fertility doctor soon to determine the cause and the treatment pathway 
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Kind Regards