Infection In Semen. What Is Reason And Cure?

hai doctor, I had my semen analysis done. Here is the report Volume- 3.6 ml Liquefaction time- 30 Mins Total Spermatoza Count- 45 Million/Ml Morphology- 8% Motility Grade 1- 10% Grade 2- 10% Grade 3- 5% Grade 4- Nil Dead- 75% Pus Cells- 8-10/ Hpf Rbc- Nil Gram Stain- Gram positive cocci Culture- coagulase negative staphylococcus species grown (heavy) I was told that i have infection, can i know that is the reason behind the infection. I have been very clean and always kept my private parts shaved once in a month.