The Big Bang Theory Episode 2.06 The Cooper-Nowitzki Theorem

After speaking at a student seminar, Sheldon finds himself with a groupie named Ramona Nowitzki. She's young and beautiful and prepared to do anything for Sheldon so he can focus entirely on his work. Leonard, Penny, Wolowitz and Koothrappali are stymied by Ramona's attentions, especially when they seem to cross professional boundaries. As they try to figure out what Sheldon's "deal" is, Sheldon appears to be initially charmed by the attention. However, when it gets to be too much, Sheldon has no idea how to extricate himself from the situation.