In many (though definitely not all) sects of orthodox Judaism going to a traditional college before marriage is frowned upon.
Let's face it, for many students a majority of undergrad college life is about who you hooked up, where you partied, or what you smoked last night. It's fairly incompatible with life in a sect like mine (and most other sects of orthodox judaism) where 99.9% of first-time marriages are between 2 virgins.