"I had no idea where pee came out of until I was 18 and my high school-aged sister drew a diagram. Her diagram was incorrect, and I didn't learn where my urethra was until I was 19 and a sophomore in college.As a preteen, I didn't know women grew pubic hair because the diagrams were always bare. Because I had no idea what a vagina looked like other than a doll-like illustration, I thought my genitals were malformed, and I was terrified to go to my first gynecologist appointment. I didn't know what an erection was until my goofy brother made a dirty joke when I was 17. He was horrified that he had to teach me male anatomy in order for me to understand the joke."—Samantha, 25, US (Iowa)