There is a steep slide in a german water park that women aren’t allowed to ride. The reason is that if ridden with legs spread, water can forcefully enter the vagina and cause injuries. So that’s a real possibility.
I don't remember the size, but at the end of the slide there is about 2-3 inches of standing water in the chute which I guess serves as the "water brake". I was wearing some long swimming shorts, but after hitting that water brake butt and feet first, once I stood up it looked like I was wearing a speedo since the blast of water going between my legs gave me the worlds largest wedgie.
Never rode a slide like that again. I used to stand at the end and laugh at the people getting off and having to pull their cloths out of their crotch as they walked off like penguins.
I also always wear a vest, even though I can swim just fine, because the ski can hit you in the head and knock you out. Also, people sometimes pass out and drown from the CO coming off the engine.
More than the internal injuries that could be caused by water forcibly entering the vagina? Probably not.
See references of this paper which refer to some specific instances: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1305204/
Edit: the term is "water skiing enema" for rectally injected water injuries... The worst case scenario is severe lacerations to the vagina wall or a rectal blow out.
https://www.sheknows.com/health-and-wellness/articles/809730...