Pelagianism is a theological theory named after Pelagius. It is the belief that original sin did not taint human nature (which God called very good), and that mortal will is still capable of choosing good or evil without Divine aid.
Girl #1: So, we have a bet — if I have sex first, then I have to wear a shirt that she’s written all over, but if she— [looks around].
Girl #2: If she what?
Girl #1: … I’ll tell you later. I feel like people are listening, and I don’t want to end up on some website.