there isn't any evidence that using children for your sexual pleasure is not harmful to them.
Ignoring the often repeated psychological studies for the sake of streamlining discussion...
...there's still a matter of physical scale to consider that'd harm them, right?In my opinion, it's not abuse if the child doesn't resist or wasn't manipulated to have sex.
Not even related to the scale?
Ę̵̚x̸͎̾i̴͚̽s̵̻͐t̷͐ͅe̷̯͠n̴̤̚t̵̻̅i̵͉̿a̴̮͊l̵͍̂ ̴̹̕D̵̤̀e̸͓͂t̵̢͂e̴͕̓c̸̗̄t̴̗̿ï̶̪v̷̲̍é̵͔
