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treatment of high viscosity of semen:

1. consult fertility doctor to do the needed medical exmantion and determine treatment pathways 
2. stop smoking and alcohol 
3. eat food that increase sperm quality :red meat, shrimp, eggs , carrot , walnut , almond ,beans and mashrooms , kidney beans, yams, clams and oysters
4. take suppliment such as zinc and vitamin E 
5. take medication such as Acetylcysteine after doctor consultation 

causes of high viscosity of semen: 

1. life style 
2. prostate dysfunction 
3. infection
4. seminal vesicles disfunctions

general advices about 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 
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Kind Regards