Okay so my brother decided to have the 'talk' with me. To save me parents some trouble.
"So the guy takes his penis and inserts it into here vagina. The he-"
"I'm not stupid. I've had sex before."
Good thing my parents weren't around.
"SINCE WHEN?!!"
"I've never actually had real sex, just read book about it."
And that was the end of that.