Before Amanda Bynes did her thing on She’s the Man (it was a time when life was simpler for her), Joyce Hyser did some of her own gender masquerading in the cult classic Just One of the Guys. It is a quintessential teen romantic comedy of the ’80s — mainly because it stars William Zabka as the resident high school bully and because it has a gratuitous PG-13 boob shot. It is certainly an overlooked classic of the Fast Times at Ridgemont High variety (you can snag it on Netflix).
In this particular scene, Terry (Hyser) gets a lesson on how to be a guy from her younger brother Buddy (Billy Jayne of Parker Lewis Can’t Lose fame). Lots of time is spent on crotch adjustment. Feel free to take notes.