Very interesting question.
We usually use pine and aspen trees for construction and the benches, aspen trees usually on the benches and pine in the construction.
The main reason a sauna can stay good and healthy is because of the heat the fireplace radiates, that combined with the sturdy wood that has a lot of resin acids makes them very very durable. The resin leaks out like sap when the wood shrinks because of the heat and creates a natural protection of the wood.
And you will also have the sauna running after that you are done(recommended) for maybe half an hour so it will dry up the excess steam and water that has been accumulated while steaming/sauna-ing
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