Watch The Principles of Lust (2003) HD Full Movie Free on SolarMovie. Watch The Principles of Lust (2003) online free. Crippled by his writer's block, Paul enters into a new, exciting relationship with risk-taking Billy...Crippled by his writer's block, Paul enters into a new, exciting relationship with risk-taking Billy and super-sexy Juliette. As it becomes increasingly tangled, however, he must choose one of them over the other.