"The Skank Reflex Analysis" is the first episode of the fifth season of The Big Bang Theory that first aired on CBS on September 22, 2011.
Leonard explains that while he does not want to get back with Penny, he cannot deal that she slept with one of his friends, and is also confused because of his uncertain relationship status with Priya.
His mother, despite her being an expert in psychology, parenting and child development, has no advice other than "Buck up, sissy pants".
Wanting to avoid awkward encounters with Leonard and the others, Penny asks to sleep over at Amy's apartment for the night.
With the lack of enthusiasm apparent among the team due to the recent events, Sheldon, blaming himself, sacrifices himself to the geology department and the gang rush out to avenge him, thereby claiming a victory.
As Leonard tries to dissuade her, she is interrupted by a phone call from an agent who tells her she got a part in a hemorrhoid cream commercial.
[8] Jenna Busch of IGN rated it 9/10 and wrote that "for me, the strongest scenes were between Amy Farrah Fowler and Penny.