After I have masturbated, I have a very strong urinary stream. Why?
Do you mean it makes you squirt?
I think you should consult the urologist. I've same issues, but I've been diagnosed with prostatitis. As far as I know, your prostate gland is slightly swollen due to infection. With masturbation the prostate is sort of flushed out clean, thus better opening for the urine to pass through.