The movie is basically about rape and unhealthy and abusive relationships. I've read reviews saying that it's every woman's fantasy to have some relationship like this but honestly, as a woman, I can assure you it's NOT. The movie itself is pretty unrealistic, and there's no background for characters. For all we know Massimo is part of mafia and shows up from the middle of nowhere in Laura's life and suddenly falls in love with her.
By the way I saw some people saying that they were inspired by this movie and have locked they're girlfriends up in their basements. I hope those guys are just joking.