QFT
Anyway...what one needs to do is freaking talk to the chick. If you can't peg it with that ID or not isn't going to help. I think most that fuck underage girls and 'cry I didn't know' really knew and just didn't want to admit to it.
Once you start getting ass you can be more selective. If you are living with mom and dad at beyond 21 then you are forced to fuck minors or social disasters.
I ended up with a model that was 12 (I was only 16). Swore she was older than me. After a bit of questions and messing around I got the 'when I am old enough to drive' bomb dropped.
Technically she would have been fair game at my age. I don't think I could have fucked her, but a blowjob wouldn't have been that bad.
My morals got the best of me that night.
All I know is almost every chick I knew had a fake ID around 16 or so. Most never needed to use them (clubs were 18 and over for them as chicks).