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Dear Customer
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what is the normal penis size :

length : 8-18 cm 
width :3-5 cm 
circumfrance : 10-12 cm 

how to increase penis size  ?

1. you can use some medication which are prescriped by specialist doctor such as  Sildenafil ( viagra ) ,tadalafil (cialis ) and Vardenafil ( levitra )
2. there is a surgical option that may increase you penis size about 4-6 cm by cut out the internal tendons that connect pelvic area to your private area and leave bigger space to penis to increase 
3. there is a plastic surgery that increase penis size by implanting silicon implants in the upper areas of penis goes into the internal area of penis and it increase penis size around 6-8 cm or more
- please avoid products or tools that claims it can increase penis size because its not medically approved and lack of long term effectivness 

common advices to increase your sexual ability :

1. following the healthy and appropriate way to do the sexual intercourse with your partner 
2. having a regular healthy diet 
3. doing exercises and give up bad habits like smoking and drinking alcohol 
4. avoiding stress and anxiaty sources 

our advice 

dear customer ,reaching to a size of 7 inch isnt hard ( 17 cm ) , but its not recommanded to go under through any surgery if your penis size is within normal , instead you can be focusing on sexual techinque and harmony with partner 
You can also ask our other certified experts in various fields such as: Nutritionists, Lawyers, IT Experts, Therapists, Mechanics, Doctors, Handymen, and more.

Kind Regards