I myself do not always orgasm during intercourse sometimes you need a little stimulation!!! However I have also wondered about the whole g-spot stimulation and it feeling like you need to pee, TRUST ME you will not pee!!! Let it go and keep on letting him stimulate you the peeing sensation WILL go away!!!! And after the peeing sensation goes away the orgasm is awesome!!!! I don't know about the ejaculation difference, but try it you will not be disappointed!!!!!
I really feel for you! I have had the same issue for 9 years with my husband & we have really great sex! But sometimes he hits things just right & I feel like I need to pee. I don't let that sensation continue.... ever. I have been told by many, many people that I won't pee; that I may even ejaculate. I just don't believe it. I don't make the sex stop or anything though sometimes I leave to pee real quick (same results as you). I usually just change activities or positions with him. It seems to be a 50/50 argument among the medical community as to whether it is pee or not. The best advice I have found: if you are enjoying yourself & you are sure you have an empty bladder, then go with the flow so speak. Maybe in the shower the first time if you are still worried? The resulting orgasms are supposed to be earth shattering. Or be paranoid like me... =/ I have enough earth shattering orgasms already that I don't feel too left out. ;D
Thanks for the comments! It is very insightful :D