The easy answer is wood is not a good idea in a bathroom.
Others have mentioned the warping and rotting dangers, but keep in mind that's only half the problem.
The other half is that if it's an upstairs bathroom, and water gets on the floor, it can very easily find its way down to the ceiling of the floor below. (especially if you have plank style subfloor, but even with plywood)
That could creat a messy repair job you might want to avoid (every time it happens). But even if it doesn't go that far, you trap water in a floor like that and you're almost surely going to start getting mold in there, and that's something else to consider. You could also be creating a rot problem in the joists that you don't even see until the floor gets squishy.
If you still feel it's worth the risk, rot resistant woods are your best bet - teak etc. instead of hoping to seal the water out with a top finish.
If you were to go with a more common hardwood, oak, ash, maple, etc it IS going to rot out eventually.
But one way to think about that is how long has the current floor lasted? It's not uncommon to redo a bathroom floor every 15 years or so. And there's a good chance it'd last that long well enough, provided you keep it dry, the toilet doesnt leak and condensation isn't bad.
Engineered floors might be marginally better, especically since the groves tend to all have a lip that would help trap water to keep it from flowing down and through (though not a sure thing at all - and you still have end joints)
Personally I'd avoid it.
It's tempting, but there's a lot to be said for a good quality tile and a mesh heater. Then it's care free and if you do it right, the only reason to ever change it will be if your tastes change.
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