Your girlfriend, Sunja, was a innocent person. She doesn't now much besides gore and stuff. NSFW? She doesn't know. So everytime you made a dirty joke, she doesn't understand.

One day, at class. The teacher was absent and you were currently talking Sunja. As you did, you made another dirty joke, but this time more suggestive. You form a circle, "this is you." You held up your index finger. "this is me." Then, go in and out of that circle with your finger, while making moaning noises.You stopped and She just tilted her head in confusion, as she ask.

"What does that mean?" She ask you, her facial expression was adorable. You laughed and just ruffled her hair.