There are dark sides. It is not the friendly industry oft portrayed. It is an industry that thrives on the young and naive. It is regulated because it needs to be. Most common complaint heard by lawyers in the field: "I did the shoot, the movie is on the website, but I haven't been paid." Followed worryingly by: "They said I had to because I had signed a contract."
The advice I give to anyone going to work on their first porn shoot: Bring a friend. Someone older, with a car, who will be on the set with you at all times.