Seing how they 1) can get it up with lots of others in the room and cameas pointing at them and 2) last fairly long while fucking what's supposed to be their dream actress, I'm thinking the guys are at least semi pros. While making a porn movie *sounds* like a dream come true, it's not as easy to perform under those circumstances as people seem to think.
If it were real, at least some of the guys would fail and I haven't seen one yet where that happened.