Many teen magazines have teens in bikinis, in sexy clothing doing sexy poses.
Showing skin , showing cleavage, showing thighs.

It just doesn't make sense. Why they tell us one thing and then allow it sometimes? Is it all about money or something?

Its what the readers want plus its not illegal.

Why they tell us one thing and then allow it sometimes?
What does this mean? Who is "they"?

After reading many of your questions,

Do you have a obsession or problem with children.

Most people don't see sexy when they look at a child in clothing