Source of fluid One very practical objection relates to the reported volumes ejaculated since this fluid must be stored somewhere in the pelvis, of which the urinary bladder is the largest source. The actual volume of the para-urethral tissue is quite small. By comparison, male ejaculate varies from 0.2–6.6 mL (0.04–1.3 tsp) (95% confidence interval), with a maximum of 13 mL (2.6 tsp).[75] Therefore claims of larger amounts of ejaculate are likely to contain at least some amount of urine. The eleven specimens analyzed by Goldberg in 1983,[73] ranged from 3–15 mL (0.6–3.0 tsp).[74] One source states that Skene's glands are capable of excreting 30–50 mL (6–10 tsp) in 30–50 seconds,[63] but it is unclear how this was measured and has not been confirmed. One approach is to use a chemical like methylene blue (or drugs like Urised which contain it) so that any urinary component can be detected.[74] Belzer showed that in one woman he studied, the dye was found in her urine, but not her orgasmic expulsion.[40] PAP and PSA have been identified in the para-urethral tissues, using biochemical and immunohistochemical methods, suggesting that the ejaculate likely arises from the ducts in these tissues, in a manner homologous to that in the male.[76][77][78][79][80] Another marker common to the prostate/para-urethral tissue in the both sexes is Human Protein 1.[81] PSA occurs in urine, and is elevated in post-orgasmic samples compared to pre-orgasmic. Simultaneous collection of ejaculate also showed PSA in both urine and ejaculate in all cases.
lol does this help? there is urine in yours (the male) too
Originally Posted by Dee Licious
I like to think of myself as, at least, pretty average, and I sure as hell don't jizz enough to soak the bed. So while there may be trace amounts of urine in my semen (hey, they go through the same tube) I'm thinking it's gotta be much higher than trace amounts if sheet soaking is going on.
According to the wikipedia article on female ejaculation, none of the papers cited have been published in a peer reviewed journal, which makes their scientific credibility questionable at best.