System of a Down: "Virginity". So, regarding concert virginity, in a way...
My first rock concert was Bob Dylan... but I don't think that counted because I had a seat, not floorspace. So I only count that as second base (with first being just friggin' listening to music).
After that, I kinda lose track... musta been all the drugs... I THINK it was Hole. Courtney Love... don't pretend that she's not amazing in many very strange, slightly scummy, and fantastic ways... it would have been about 11 years ago, I think..? Francis Bean wasn't walking yet, and just before the show she brought her out into the wings to show her the crowd... I'm pretty sure the original bassist (was it the bassist?) had already turned up dead in a bathtub, too.
That was a fantastic show... God, that was a great band. I came out with heat exhaustion and a WICKED hangover the next day, bruises in places I didn't know could bruise... yeah, so as far as concert goes, that was my first home run. *wistful sigh*