He is basing his "moraility" on facts. I attended UND, hooked up with quite a few women during my first two years, and what he is saying is true. You are either on one side of the fence or the other when it comes to your freshman year.
Daddies little girl is set loose, and some will remain sweet and innocent, while a great majority of them use the new found freedom to party and have sex.
By the time you hit your Jr or Sr year, you are for the most part mellowing out and by the time you graduate, you are kinda bored with the "game" as it was previously defined. At that point, so you start looking for stability as you begin your carreer and hopefully you find it.
Been married 5 years, two children and very happy with my life -- but I wouldn't change my Freshman year for the world.