The girls meet their new roommate, Kacey. Bela weighs whether a nice guy is hot or not, Kimberly visits her first sex shop, and Whitney's increasingly busy schedule leads to some complications with a professor.

It's Parents Weekend at Essex once again! The girls do everything they can to keep their visiting families out of their dating lives, all while conducting an important science experiment for Bela and learning more about their new roommate Kacey.