Penny (The Big Bang Theory)
In the first episode, Leonard falls in love with Penny and tries to get her to date him but she thinks he’s just a friend. When he asks her to date him, she thinks he’s inviting her to eat with him and his friends.  When Leonard is goes to the North Pole, Penny worries about him and when he comes back they have sex. Penny asks Sheldon if she should date Leonard and Sheldon tells her about Schrödinger's cat. So she decides to date Leonard.