I haven't even met her yet, so... yeah, what Tintin said.
But to the intent of the OP, the Bible is silent about kissing before marriage. It does have something to say about... other things... before marriage though. If you think kissing will lead to... other things... then you probably shouldn't. But if a person has that little self control, or if he believes his lady love has that little self control, they might want to rethink this whole relationship anyway.