I need some help here people!

I am 50 years old. My nephew has a 15 or 16 year old. By text, he just came out to me and ask me to teach him how to have sex.Of course I am not going to have sex with him. I straight for one thing. Not sure why he picked me. But I am very gay friendly.He lives in a really small town. Hell, I knew he was gay for a couple of years. I don't want to crush the guy. But still what the hell should I tell him? He is just confused kid in a hick town in texas.