It is scripted! Every people that do sex on camera is paid and is a porn actor. And it's not just BigDaddy, they are no productions that uses strangers in their movies. First of all, it would be illegal to film yourself having sex without the other person's consent. Secondly, don't you find it strange that people you are supposed to be straight ( most of the time ) would be so ready and open to have gay sex? Plus, we all know that the hole doesn't clean by itself which means there would be a lot of videos that would have ended up in the fetisch category of this site  :hehe:
If you have done some researches you'd have found the answer a long time ago 'cause it has already been answered and there are even sites that gives the actors' names in each scenes in case you want to see more about him