Roommate agreement with apartment flag logo. The Roommate Agreement was written by Sheldon and was signed by Leonard when they first became roommates. These events were shown during a flashback in "The Staircase Implementation".
Sheldon and Amy must kiss only on date nights. Either party must not undergo cosmetic surgery unless it's to look like a Klingon, as seen in "The Bachelor Party Corrosion" (S9E13). There is a “no nostalgia” clause.
The Staircase Implementation - The Big Theory (Season 3, Episode 22) - Apple TV.
It dictates what Leonard has to eat each day of the week, what TV shows he is allowed to watch, whether he has a girlfriend stay over, that he has to drive Sheldon everywhere he wishes to go, whenever he wishes. It even dictates when Leonard is allowed to use the bathroom.
Sheldon never met Leonard, Howard, and Raj until they were all around 24. Penny didn't move into the building until Sheldon and Leonard were both 27 and have been living there as roommates and best friends for three years; Penny was only 21 then.
The relationship contract states that Sheldon "must take Amy out to a nice restaurant and have casual physical contact that disinterested onlookers would liken to intimacy." A slight touch on the hand is enough to get Amy's engine humming!
Amy Farrah Fowler. Amy Farrah Fowler is a fictional character in the CBS television series The Big Theory, portrayed by Mayim Bialik. Amy is a neuroscientist who is the love interest of Sheldon Cooper (Jim Parsons) and subsequent wife in the series.
("S2 Ep10")
Do Not Use Each Other's Things Without Asking. Not using each other's things without asking is one of the more obvious roommate rules. While some people are more casual about sharing, others are not. You have to learn what kind of person your roommate is and then act ingly.