Just to throw a different perspective in on the sex before marriage front - First, were Adam and Eve (whether they are part of our Christian mythology or actually real people) ever married?  Did they have a ceremony in which a clergy person blessed their relationship? 

In much of biblical tradition/culture, marriage consisted of a father giving his daughter to another man and after a weeklong celebration they would consumate the property transaction through intercourse.  When Samson marries his first Philistine wife, they have the wedding banquet for a week and then he leaves when he gets mad at the guests and never "seals the deal" - when he comes back to claim his wife a year later, the father of the bride has already given her to another. In other cases, a sexual encounter would be followed by the man being forced to marry the woman - or else death might be the consequence. 

I got to thinking about that and the movie "What Happens in Vegas" where Ashton Kutcher and Cameron Diaz have a wild time partying in Vegas, and wake up married the next morning.  The divorce judge won't let them divorce until they have lived together for so and so long.  They were absolutely strangers - had sex/got married - and spent the rest of the film learning about what commitment, love, and marriage were really all about.  It's probably a closer example to "biblical marriage" than we get in most other places!

Our modern day romances are so much about the feelings of love and choosing who we marry that it's difficult to even apply biblical principles to a radically different social phenomenon.