Alec Greven is a nine-year-old ladies man who's written a book called How to Talk to Girls. He tells Today Show host Meredith Viera his tips of the trade, one of which is to comb your hair and not wear sweatpants because girls don't like "grubby" guys.

According to NBC:

Alec Greven, a fourth-grader at at Soaring Hawk Elementary School in Castle Rock, Colo., began writing the book "How to Talk to Girls" — about the dos and don'ts of dating — when he was 8 years old. The book came out of a school writing assignment, and he so impressed his teacher and principal that the book was sold for $3 at the school book fair and became the fair's top seller. The book eventually made its way into the hands of a publisher, and Alec has since been doling out advice to boys of all ages all over the country. He spoke to TODAYshow.com about what inspired him to write this book, why boys should stay away from "pretty girls" and what the future holds for him as a dating expert.

A great Greven gem for college students: girls like the smartest boy in the class, so act smart. What an astute little playa!