Hmmm. I think it really depends on a lot of things. If you really like the person and she seems to really like you, then I don't think it would be too much of a problem.
In the only relationship I've ever been in (and am still in very happily) we kissed several times on the first date.. with tongue. It wasn't me being forward, or her.. it was just sort of mutual although I think we were both a little surprised. Truth be told, it was also pretty sloppy and bad, but I don't regret it at all. Then again, this is a sort of different situation because we both knew each other quite well going into the whole first date situation.
So all in all, it totally depends on the situation.. I think maybe it's best to just go with what feels right and not trick yourself out of it. After all, what other reason do we do things for than because 'it seemed like a good idea at the time'.
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"Hold on to the corners of today, and we'll fold it up to save until it's needed."