I had to specifically search out any of the "titty streams" that you speak of.
If kids are going to seek it out, they're going to seek it out. The problem is that porn sites generally have a much lower quality level, as people just sweep it under the rug and expect it to be seedy and gross.
Sex is not evil, peoples bodies aren't shameful. The entire reason these streams are so effective at exploiting that is because of the shaming and ostracizing of sex positivity. This isn't a good thing, it's just damage control as they lose advertising revenue as pearl clutchers whine about it in their monthly letter to the editor.