@Switch Blayde
Is that restricted to images or also story content? Can the character engaging in sex in the story be under 18 (say 15)?
Enforcement is for 14 and up. Although, since money is involved and money can be traced to real identities, I encourage 18 and up only.
If something changes legally in the future, it would be wise to keep things strictly legal.
2) Is there a minimum/maximum price for the book?
It can be free.
But if there is a price, then the system won't accept less than $.99. The price column in the database has an upper limit of $999.99
3) Is there a minimum/maximum size (number of words)?
No maximum. But one must be reasonable with the minimum especially with for sale stuff. Would anybody buy something less than 5,000 word? I don't really know, but I would expect unhappy readers and refund requests in such a case.