We have bought a campervan and it has a cork mat in the shower/toilet.
I think it's unhygienic, especially with piddly men and boys using the toilet. I've bought some varnish to seal it and it looks okay (no shine) but does it actually keep all liquids out??
It's such a small space in the van and we have to remove the mat when we have a shower but then it's put back to stand on and is fitted right under the toilet.