Having a large dating pool, which is now possible through online dating, is important. There is always another relationship available so this one does not have to be so fraught with meaning.
In which case, don't be as hung up on sex before marriage as some of the posters on this thread have been. Most couples have sex within the first 5 dates and it doesn't mean that you have to marry the girl either.
Just have fun, practise sex safely, and you'll probably learn something about yourself along the way!