Decoys 2: Alien Seduction (2007) - DVD - used

Also called Decoys: The Second Seduction.

Per IMDB: "Sam, a college student in a small Northwestern town, reluctantly joins his roommates in a contest to see who can hook up with the most gorgeous co-eds by the end of the semester. But when men slowly start disappearing around town, he and his friends learn that when it comes to beautiful women, it's what's inside that really matters."