isn't that called prostitution?

But he didn't lie. Saul believed he was Kevin Costner. That's what he tells Walter in BB, and when the girl wakes him up the next morning and says he's not Kevin Costner, Saul replies "I was last night." You have no basis to claim he was lying. He wasn't telling the truth, but at worst he just didn't know he wasn't…

If it were suicide, that would make all the coughing seen previously multiple times completely meaningless. I'd like to believe the reason he died was due to a sign we did see rather than a sign we didn't see.