lunchbox

I am only 18 and so is my girlfriend and we've had sex twice and the first time was her first time. but it wasn't really that bad. I read the 'breaking a cherry advice' post after we had sex but we didn't have that problem. she used tampons and we never had a hymen problem because as has been said before it usually gets broken by a tampon anyway. but I still have a question spawned by ratbastid's post and comments of others. If we don't have a problem with lubrication or if the natural juices/lubricated condoms work fine should lube still be used? We are no way into the hours and hours of sex state yet but we've made love enough where she's came 4 times and i've came once and pulled out. but you're all making it sound like no matter what lube should be used, and this sounds asinine to me and maybe i'm just being dumb but any light on this issue would be great. thanks for anything you can say about this, you guys are a rare breed of people and a great help to everyone in this community.