Spanish is my native language so I might be able to help here. I went to terra.es and read terms and conditions.
Terra seems to be a free host of the same kind as geocities and the like.
Their terms and conditions specify that pornography is not allowed.
what they mean by pornography (after going to most respected dictionary of the spanish language) is any material related or refering to prostitution or obscene. Obscene they define it as anything offensive to decency.
I would not be surprised if the adult sites hosted there disapeared soon, but then again it is not like they haven't noticed they are hosting such sites so, who knows why they haven't yet or if they ever will. But their terms are clear and if I had bumped into terra (without knowing there are a few who do host their adult sites or galleries there)and read their terms and conditions I would have never posted an adult site there.
I hope it helps.
Enjoy
