The Big Bang Theory Episode 6.23 The Love Spell Potential

The girls get excited about a trip to Vegas, and the guys use the opportunity to have a Dungeons & Dragons night. However, when the girls' trip gets derailed after a snafu with airport security, they return to the apartment and wind up joining the D&D game. After some drinks, Penny lets it slip that Sheldon could see himself getting physically intimate with Amy in the future, but Sheldon denies it and says he's not ready yet. Amy gets upset and goes to hide in Sheldon's bedroom, where he follows and they have a heart to heart. Sheldon reaffirms that he's not ready for that level of intimacy yet, but he could be in the future, so they end up doing a bit of verbal role playing behind closed doors. Meanwhile, Koothrappali and Lucy go on a date, and he encourages her to step further outside her comfort zone by sending food that she ordered back to the kitchen. Lucy gets uncomfortable and tries to sneak out the bathroom window again, but she gets stuck in a locked alleyway and is forced to call Koothrappali for help. Koothrappali can't get the gate unlocked, but they do talk things over, and it results in them kissing for the first time - through the fence.