I would never wait until marriage. As my mom has always said, you have to "test-drive the car before you buy it". I would want to know that the sex worked (it IS a very important part of a relationship) before committing my future to someone. I would NOT want the wedding night to be awkward and fumbling like it often is the first time. Whatever floats your boat, I suppose, but for me I would rather have an experienced guy who knew how to pleasure a woman, than someone who had no idea what he was doing.