Around 14 is usually when you start highschool, so technically a 14 year old reading a manga about two guys doing it isn't that bad. Around that age, hormones start to get funky and all. I belive that those 13 and younger though should just, erm... Idk? There's nothing anybody can do about this, just having a phone is like having a box of po**, anybody can get it if they type a word or two.