Why do you think there is urine and semen merged together. There is something called retrograde ejaculation but that is usually the reverse, sperm found in your urine (rather than urine in your sperm). Maybe it doesn't matter but many with this condition report 'dry orgasm'. This isn't you, correct? More information would be helpful. Here's information on that condition though. https://www.mayoclinic.org/diseases-conditions/retrograde-ejaculation/symptoms-causes/syc-20354890 Do you have any prostate problems that you are aware of?