Love Object (2003)

The twisted tale of Kenneth, socially insecure technical writer who forms an obsessive relationship with "Nikki", an anatomically accurate silicone sex doll he orders over the Internet. Because of his experience with his new toy, 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. But when the doll's jealous personality invades his consciousness, Kenneth becomes trapped in a perverse triangle, torn between the dominating, silicone Nikki and the flesh-and-blood Lisa. (imdb)