It's indecent to try to watch someone for sexual gratification.
Tim comes home to find his roommate’s door wide open, and he clearly sees the roommate having sex with his girlfriend.
Tim needs to decide if he should keep watching them.
Tim averts his eyes and walks to a room without a direct view of his roommates door, making sure to make enough noise so that they know they aren't alone.
Tim can't take his eyes off of the scene until the roommate eventually looks up and realizes he is being watched.
Tim hears his roommate’s door slam and some scrambling in the room, but he doesn't feel guilty because it wasn't his fault that they didn’t close the door earlier.
The roommate yells at Tim, then the girlfriend yells out, and everyone is highly embarrassed.