Reality TV is where a bunch of people expose parts of their real life and mix it in with a bit of underhanded back stabbing to win a prize. I think, on the buss .com was a reality site with gay guys heading out to burning man.

In porn, These days, you define it by the tour I guess as it's now a layout term and not a content type.

Dude Dorm and the like are cam houses yes, but a cam house is about as close to a reality site as you can get. Minus the weekly games for head of house and kicking people out as the weeks go on.