Going Out with a Bang (2015)

In a post-apocalyptic world full of zombies, two people find themselves trapped in a basement with no escape except facing the zombies outside and risking their lives. The two individuals, Gordon and Rachelle, just so happened to go to the same high school and decided to team up. Realizing they might die, they decide to "enjoy" each others company since they both have never felt the intimacy of the opposite sex. Most likely the two last virgins on Earth, they decide to explore the sexual world for the first time but unfortunately, things take a turn for the weird.