ejaculation and urination... need help

I am 18 and during stimulation I urinate. By stimulation I mean; During foreplay with my girlfriend after pre-cum i usually have to go to the bathroom...of coarse i do not, i simply hold it. When stimulating my head during masturbation I have a desire to urinate and i usually do. And directly after ejaculation i feel a strong need to urinate and i usually do because it is extremely pleasurable. I can choose not to urinate after ejaculation...but if stimulation continues after ejaculation the desire is usually to strong and i cannot prevent it... it is like a second ejaculation in that at a certain point of stimulation after ejaculation i cannot stop it, however it is urine. I tried to be as descriptive and informative as possible because i really need an answer as to whether or not this is a problem because if it is i need to fix it as soon as possible. and please no answers that are speculation or opinions. i take health very seriously. thank you so much in advance.