if it was the same episode he was questioning those prisoners if it was right that they were "gunning" (wanking) at the female prison guards as the prisoners were so sexually starved and frustrated. Louis had the balls to take them to task over this. I think the prisoners were probably just lonely and bored and were glad of anyone new to talk to. Im not diminishing Louis's skills at putting together some of the best documentaries of their type, i dont think they can be made without some sort of judgement, or compariosn against what is considered normal.
Have you ever seen Current TV, I dont think that channel lasted long, but there were some docs on there as good as Louis Theroux, one was made by a young female reporter about the escort industry, and interviweing the escorts, punters, and McCoy who wrote a guide about every parlour in the uk. He was a sleaze bag, he told her 'none of the girls are as even as attractive as you". Wow, you sweet talking devil, no wonder you're such an expert on parlours. :/