I was going to ask "why are YOU"...but I know the answer already 
Since my question was, Why are they
not enjoying this?" It would follow that your question would be, why are you
not enjoying this? If you are asking me why I am not enjoying it, then the answer is this: I am not enjoying it because watching an Internet video of a couple of young punks getting it on, is not my thing. In addition the dude getting the blowjob doesn't really look too happy about it. Is he conflicted? We simply do not know.
-Truth is that my comment was idle chatter and nothing more. You might be making too much of it. But, I am always happy to play along.