Why does it follow that the fact that some of our military sign up for waterboard training make waterboarding not torture? Why? Why not just say that these guys sign up to learn how to deal with torture by dealing with some of it during training. The fact that they beg for it to stop very quickly once it happens is better evidence that it is torture.
In a traditional understanding of everlasting hellfire a person has a resurrection body which is never consumed by the flames of hell, but the flames inflict pain on that person without any actual organ damage. So, I guess, no one gets tortured in hell. I'm sure that'll be a relief to everyone who goes there.
We have to look at what we ordinarily mean when we use words. Inflicting suffering of any kind on a person so that they will do anything to make it stop is the very essence of torture. The rest is quibbling. My Clinton parallel works like this, in case you couldn't see the logic. Bill Clinton denied that he had had "sexual relations" with Monica Lewinsky by using a technical, legal definition of sexual relations which could be used to exclude oral sex performed on him. But it was still very deceitful because most of his listeners weren't thinking in terms of the technical definition, they were thinking in more common-sense terms.
This is the international legal definition of torture, provided by a commentator on Triablogue:
"any act by which severe pain or suffering, whether physical or mental, is intentionally inflicted on a person for such purposes as obtaining from him or a third person information or a confession, punishing him for an act he or a third person has committed or is suspected of having committed, or intimidating or coercing him or a third person, or for any reason based on discrimination of any kind, when such pain or suffering is inflicted by or at the instigation of or with the consent or acquiescence of a public official or other person acting in an official capacity. It does not include pain or suffering arising only from, inherent in or incidental to lawful sanctions."
This makes it clear that by the legal definition, it doesn't matter if the suffering is physical or psychological.