"The Vicious Kind" is a film about a man (played by Adam Scott) who has been emotionally damaged by his own experiences in love as well as the failed relationship of his parents.  When his younger brother brings a new girlfriend (played by Brittany Snow) home from college for Thanksgiving, Adam Scott's character tries to warn his brother about the ills of love and steer the couple apart to protect his brother from getting hurt like he has been.  In the process of doing so, the older brother finds himself infatuated with his younger brother's new girlfriend, and vice versa.  They end up having sex the same night the younger brother loses his virginity to his girlfriend.  The father discovers this but because the older brother and and his father both have blackmail worthy information on each other, neither of them says a word and the younger brother and girlfriend head back to college.  

1) Sternberg's Triangular Theory of Love is very applicable to this film.  The love shared by Adam Scott and Brittany Snow's character would be classified as infatuating love because it is full of passion and irresistible excitement. However, when it is time to return back to college, the two surrender to going separate ways without a fight.  The little intimacy that had been developed is dissolved and the two seem to move on, denoting the lack of commitment.  

2) Lee's Style of Loving is also applicable to "The Vicious Kind."  In this case, Lee would classify the love present as erotic (eros) and maniacal (mania).  When the older brother first sees his younger brother's girlfriend, he is immediately drawn to her physically, being reminded of a past lover.  He cannot stop staring at her, dreaming about her, thinking about her.  They lose sleep thinking of one another.  Adam Scott's character even follows his brother's girlfriend into the grocery store and comes to the house she is staying in at night in hopes he will run into her.