"I can't sleep while she's lovin me!"

Controvery. Scandal. Pre-marital sex.
Seriously, I have my opinions on it, and I'm strong on them. I believe that pre-marital sex is stupid and wrong. You can start with the biblical reasons.
Acts 15:29
You are to abstain from food sacrificed to idols, from blood, from the meat of strangled animals and from sexual immorality. You will do well to avoid these things. Farewell.
Romans 1:24
Therefore God gave them over in the sinful desires of their hearts to sexual impurity for the degrading of their bodies with one another.
1 Corinthians 6:18
Flee from sexual immorality. All other sins a man commits are outside his body, but he who sins sexually sins against his own body.
Hebrews 13:4
Marriage should be honored by all, and the marriage bed kept pure, for God will judge the adulterer and all the sexually immoral.

And it goes on...and on...and on.
I don't think that if you are ready/have committed yourself to a person, that you are ready to sleep with them. I see it all too often that there are relationships that are ridiculously pointless, and you wonder why someone puts up with that kind of stuff. And then, you find out they're having sex. Attachment. If I'm so attached to someone that I can't break up with them no matter what, I don't want it to be over something physical. And to get married, and know that someone has already been doing whatever they want with someone else, or anyone else, that'd break my little heart. It just isn't fair to the people you're actually going to be with for the rest of your life, in my opinion.