Actually there has been some pretty exhaustive research in that area leading to the conclusion that every woman ejaculates when she orgasms. It would seem that most of us ejaculate directly into our bladders. This was also the research that showed a definite difference between urine and ejaculate. The research also showed that female ejaculate is almost identical to seminal fluid. In the experiement the women were urine tested before orgasm, directly after, and then an hour or so after. No ejaculate was present before orgasm, but directly after the contents of the bladder were almost completely ejaculate in varying degrees deending on whether the woman was a "squirter" or not. A few hours later there was no ejaculate in the urine.
The theory put forth was that every woman could learn to relax and allow the fluid to flush out of the body through the urethera but I haven't heard if that theory was put to the test. So the answer would be "it's possible" at least it seems plausible but people all being made different I am sure there are women out there who would simply be frustrated.