Rey wants to pursue a relationship with Finn, but she's nervous about never having had any kind of intimate contact with a man before. She wants to go into a relationship with Finn feeling confident that their first time will be good, not awkward or unsure.

She wants a rehearsal, and Poe is the man for the job. Even though he almost chokes when she asks him.

+ 100 for Poe (once she's talked him around) being incredibly gentle and patient, while still being funny/teasing gently to put her at ease.