Do i have sex problem ? What test i should take ?

1. Semen Analysis:

   Using this test you can get semen count. if it should be more than 40 millions .It is a very much  important. Even there is a chance of problem may occur so that need to consider other values like motile ..etc

2. Testosterone Test :

    Using this test you will know the erection quality and sex drive. this is a male hormone. It is very important for man. it must be 1.95 to 11.38 ng/mL . or 270 to 1200 ng/dL.


Reference:
http://www.healthline.com/health/low-testosterone/testosterone-levels-by-age#Adolescence3