Embedding videos from tubes
 

I'm thinking about embedding videos from major tube sites like xHamster or PornHub. So, as I understand it, those are legal tubes that doesn't publish stolen content, right? Therefore I would promoting legal content.
Did I make the right conclusion?

I think you don't need to worry about it :)
Especially if you are going to use these sites as sponsors

Yes don't worry about that.

But, I advise you to use their embed player ;)