I have also very thin semen.when passes urine the urine color is different. ?

Here are some ...: The texture of semen widely varies among men over lifetime & reflects the frequency of ejaculation - the more often, the thinner. The color of urine is irrelevant with semen color & reflects the degree of urine concentration and the foods you consume. In fact, having yellowish concentrated urine indicates having good kidney function. So, don't worry about it as long as being comfortable & OK in UA