Life Hacks/Billie's taboos and interests

Sexual history

Billie has been told since she was 3 that she was, in fact, a boy. She knows though that her privates look like a girl's privates, and that anyone who sees them will wind up thinking she is a girl immediately. She does not know what it is about her privates that will reveal this, or what a boy's privates are supposed to look like, all she knows is the warnings her dad has given her. Aside from this, most other information about sex has been intentionally hidden from Billie in order to keep her illusion from breaking.