If they hadn't had sex frequently in high school, and are decently good looking..they are probably going to do numbers in college if they're into partying... It's the ones after college who break up with their high school or college boyfriend that turn into the sluts ages 22 to 30...
That's why if you're in your 30's and looking for a significant other...you just gotta let their sexually pasts go because they weren't ready to settle down yet.