Are Jiraiya's books porn?

Evidence that it's porn

• The books all have the word makeout in the title.
• Jiraiya does research for this book by spying on naked women and having sex with prostitutes.
• Kakashi blushes when he reads it.
• If these books were romance novels as opposed to porn, it would be kind of strange for a man to be such a huge fan. Kakashi would be comparable to an army general who loves Twilight. The existence of an avid male fan base indicates that it's porn.

Counter-evidence:

• Kakashi reads this book in public. If this is porn, Kakashi is a really weird guy. One wonders what the other hand in his pocket is doing.
• Not only does he read it in public, but he talks about it openly with 12 year olds.
• Jiraiya considers it a work of art. Although, this could just be chocked up to him being a pervy.
• Naruto, a 16 year old boy, finds it boring.

So just what is this book? Is it porn? If so, I guess this means the Naruto universe has some very interesting attitudes towards sex. Is it not porn? If so, is Kakashi the equivalent of a Twilight fan?