I note that this whole thread and the 'pledge' that is being discussed is predicated on the assumption that the boys are all after sex and the girls are under pressure to give in. No mention whatsoever of young women who actually enjoy sex, encourage, indeed instigate it.
My experience, as a teenager in the swinging sixties was that almost every couple was sexually active before marriage, many having 'shotgun weddings'. Two couples I knew waited until they were married and both had difficulties with the sexual side of their marriage. I am a firm believer in 'try before you buy', (with all due precautions taken to avoid infection or pregnancy) to ensure their is compatibility in this important part of the relationship.