Rey knows about the biology of sex but doesn’t understand the point of having it. She stumbles on holo porn or walks in on something that makes her very curious and asks someone more experienced to teach her.

+ Poe, Leia, Luke as her teachers a plus. Multiple teachers a plus.
++ Finn is/was similarly inexperienced and Poe was his “Jedi master” in that area
+++ Rey has a positive experience but is somewhere on the ace spectrum , whether she realizes/defines it that way or not.