I watched this film primarily as a fan of Sienna Guillory. To be honest, she was the only thing worth hanging around for, the film became so boring at stages I felt myself drifting off to sleep. It feels incredibly long, especially once you reach the end of the movie and realise not a whole lot has actually happened. It doesn't feel original (the same ideas have been dealt with in countless better films), the acting was hardly top notch, and the characters were thoroughly unlikeable and unoriginal. Unless you're really into these types of films, or you have a *really* strong fascination with one of the actors involved, I wouldn't recommend it. You're not missing much.
Review of The Principles of Lust
