Bathroom Flooring

Depends how careful you are and whether there's little people in your house. I would think oak would be fine, provided spalshes get to evaporate off between uses. I'd be more concerned about slops of water into the underbath space and the like where it can't dry out easily - regardless of flooring, that's a bad thing. Clearly all wood can be an effective solution look at all wooden boats/japanese bath houses/swedish saunas - with good design to avoid moisture traps.

Think about it.

Your bathroom already has floorboards (modern ones are chipboard for god's sake). Do you worry about how well sealed the existing flooring is (cork, vinyl, laminate, ceramic, etc.,)? If not, then why worry about how well you can seal an oak floor. If you do worry then just make sure the bath has a functioning overflow and that your insurance policy is up to date.

MBQ