Oh, please! You people are so exaggerate!
Two or more adults in full use of their mental faculties may engage in any sexual acts they desire, as long as they do so by mutual consensus and no one's integrity is compromised at any level.
These guys have been paid to do this, so I strongly doubt that anyone has coerced them and they are not hurting anyone. Whether they do it in their private lives is none of our business - it's their life and they can live it as they see fit.
Now, would I do it? No. Would I want to watch or participate? No. However, do I have a right to condemn two adults who choose to do it? Certainly not, because it's not something that concerns me.
If you don't like it, here's something you can do: don't watch. But that's difficult, I know. It wouldn't give you the possibility to be sanctimonious after morbidly observing every single detail.