According to this Yahoo article, Walla Walla University in Washington state, a Seventh Day Adventist school, is known as "Western Wedding University." The school's chaplain actually wrote on the campus ministries web page: "The ways to get involved are endless, we just want to see you engaged (in ministry or to someone of the opposite gender :-), remember we aren't called Western Wedding University for nothing."
The evangelical emphasis on early marriage is perhaps not surprising; even evangelicals realize that young, healthy people are going to have sex, sooner or later-- probably sooner. But it's unfortunate (from my atheistic point of view) that kids feel compelled to rush into early marriage in order to keep themselves "pure" till marriage. Few of us are lucky enough to meet the person we really want to marry so early in our lives. There's nothing wrong (from a logical, secular standpoint) with dating various people, and even having sex with them, until we meet the person who really suits us. There's nothing wrong with dating one person and marrying him/her if you know s/he's the one, either-- but I hate to see people forced into early marriage due to societal pressures. The old expression "marry in haste, repent at leisure" comes to mind.