Not so--I'm part of that "5%" (which I'm sure is really higher), and I follow 'ol Fr. McCarthy's advice, "Everything in moderation" (except sin--which alcohol in itself is not!)
My husband and I managed to make it through our 4-yr dating/engagement w/o fornicating (what a way to find out how much someone loves you) and celebrated our 18th anniversary a few months ago.
Don't know if anyone mentioned this, but I found out that the study was by the Guttmacher Institute a division of Planned Murderhood, and therefore not at all credible.