There is definitly a line for me, that is really puberty vrs prepubesant
It seems to me nature determines for us when we become sexual beings. There are good reasons why we in law make it illegal to have sex with a 14 year old, they are simply not mature enough to make choices and take on the responsibilities of a sexual dynamic, especially with an adult. But, In fantasy, in story, there is no harm being done. The desire can be explored without consequence to a real human being. I agree, the solution to underage characters is simple, dont read the story
Ale
http://www.paintoy.com