Semen viscosity problem

Patient: Hi I want to ask you now about my problem which is that when i madeSperm tests, it was found that liquefaction timing for my semen was 6 hours,While the normal is 30 Fat 101 KG , 1.73 m, smoker non alcoholic and it takes a very long time for me in bed in order to ejaculate, i gets very tired during this long (20-30 minutes) intercoursehow to solve my viscosity problem?