nasty post

when I went on moviestarplanet at 2:00 in the moring  I went on artbook and I saw this most nasty stuff  why would people post nasty stuff when theres 5,6,7,8,9,10,11,12 year olds that see it  this will effect there childhood with this most nasty stuff on the internet and people Liked it ewww why would they like it ,its nasty and apart of a rule that is SEXUAL BEHAVIOR .