CHIN's

Joey is confident while preparing to make love with Rachel for the first time, but he soon becomes uncharacteristically clumsy and Rachel feels uneasy as well. They wonder how Chandler and Monica transitioned from friends to lovers so easily. Monica and Phoebe's annoying friend Amanda visits. Ross goes to a spray-on tanning salon but fails to follow the simple directions properly.

Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system. Also, Penny and Amy take Bernadette out for the night, leaving Raj and Stuart to care for baby Halley.

After a successful experiment combining their genes, Sheldon will stop at nothing to convince Amy they should procreate. Also, Koothrappali is embarrassed to tell the gang what the new woman he’s dating does for a living.

In order to continue living with Sheldon, Amy lies to him about repairs being made to her apartment and they host an "on location" episode of "Fun With Flags" in Penny’s apartment. Also, Leonard lets Penny decorate Sheldon’s old room after he learns that she has been secretly moving Leonard’s collectibles into storage.