OMG, that would require a flash flood warning for a vagina! Cripes!
Most of the liquid of an ejaculation comes from the prostate gland. The sperm get added to this liquid. A man who has had a prostectomy can still get an erection (if he is lucky) and still have an orgasm, but he no longer produces cum. The orgasm happens in the brain, not in the sex organs.
I'm trying not to be the geek kid with glasses and a calculator, boring everyone with over-precision.
But ... the prostate does indeed secrete ejaculatory fluid, but the majority of seminal fluid comes from the seminal vesicle. The prostate adds hormones and good stuff. The seminal vesicle adds volume. (The testes provide the spermatozoa, which is really at the heart of it all, but those little guys don't take up much room.)
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