Interesting that you should ask, as I had often wondered about this myself. There are two hypotheses regarding this:
1. The glands continuously generate and "pump" fluid through the ducts & into the urethra as the woman ejaculates.
2. A section of the bladder fills with "prostatic" fluid during sexual arousal, and the glands pump from this reservoir during ejaculation. An experiment testing this hypothesis involved completely emptying the bladder with a catheter prior to arousal, then using ultrasound to watch for fluid. The scan seemed to verify the researcher's hypothesis, but much more research is necessary to confirm these findings.
Either way, the chemical composition of female ejaculate leaves no doubt as to whether it is urine. (NO!)
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