rollin:
Blogger's policy statement was very vague.
...and probably deliberately so, because that gives them the greatest latitude to do whatever they please. It's up to us to figure out what the real rules are, and how they intend to apply them. I don't even know what they consider "adult content". As you note, Amazon sells thousands of "adult" items and adult titles. If you link to Amazon will they pull your blog? I doubt it!
FWIW, I haven't yet received one of those warning e-mails.