My mind cannot process the logic behind this. Which do you support?

In posts where they ask if CHILDREN shouldn't be allowed to given the opportunity to have sex, many of you are against it and want to let nature run its course.

Then again, I see posts where a girl who is 11-16 asking if she should have sex many of you go "wait until you are 18, you're too young, you're still in middle school, no no bad".