You arrive at your sister's house and see that she's had a bad day. "No.. I don't want to talk about it. You're my brother, and it's been ages since you were in high school, I'm sure you don't even remember what it's like, you wouldn't understand". She finally agrees to tell you.. "I feel like a nerd, and left out.. all of my friends have boyfriends and are having sex and I've never done anything with a boy."
You decide that maybe you can help your little sister out