Love Object (2004)

Kenneth is a socially insecure technical writer who forms an obsessive relationship with "Nikki," an anatomically accurate silicone sex doll he orders over the Internet. Kenneth's life takes a turn for the better when his newfound romantic skills attract the attention of Lisa, a co-worker at his office. When the doll's jealous personality invades his own life, Kenneth becomes trapped in a perverse triangle, torn between dominating, silicone Nikki, and the flesh and blood Lisa, who offers his only chance for redemption.