I am 60 year old male. I am master bating from age 12. Initially I used to ejaculate a few drops of colourless sticky thick fluid. At around 18 years age I ejaculated white fluid. I was detected having prostatitis about 2 years back. I stopped master bating. I restarted about 1 year back. Now a days I don't ejaculate fluid most of the times. However, when I ejaculate it is dark yellow fluid. Why is it so. What should I do for better ejaculation.