Finn is now off his First Order drug cocktail, which means his libido comes ROARING to life once he's out of the medbay. He has no idea what to do and asks Poe for instruction, basically.

Poe starts awkwardly trying to explain how to jerk it, and Finn just gets confused by the euphemisms he's using so he strips and basically asks Poe to give him step-by-step instructions.

Poe isn't sure if his brain or dick is going to explode first, but he knows they're both gonna.