So we all begin on the same page, here's a couple of human vulvas. While everyone looks a little different down below, from the front you will see pubic hair (unless it's been removed), a "pudendal cleft" where the labia majora meet, and in 50% of people some labia minora and/or clitoral hood.
Courtesy of The Labia Library.
We'll also add this caveat: Barbie is a toy. Doll toys historically have not been anatomically correct. Also, no gendered double standard exists in Barbieland: Ken is as featureless downstairs as his girlfriend. Barbie crotch in dolls is gender-neutral.
2nd century Roman doll, displayed at the Centrale Montemartini