Although wiki says otherwise I've never considered Liver to be true offal, along with the kidneys I just think of them as another tasty part of the animal. Why can it lead to gout? Something to do with the fat/cholesterol?
Edit: read further down and that's exactly the reason, although it talks about the 'potential' for high cholesterol, which I don't understand. How do you know if the particular liver you're eating is high in it or not? I also saw this link on the same page:
"Milt or soft roe also refers to the male genitalia of fish when they contain sperm, used as food."
Mmmmmm.