yeh - i got with my girlf when she was 16 and i was 18 - i just feel lucky to remember what it was like to have sex with a 16 year old - a lot of people dont. Im still with her 8 years later and love her to bits - and she is still a beast in bed. Just because she was crap to start with (as was i, im sure) we have basically learnt exactly whats good for both of us over the years. So, if this 16 year is freakin gorgeous and intersted in you then strictly there is no real issue to worry about - appart from the guaranteed scorn of your family and the current girlfriend - and, remember it may be crap to begin with but would probably get very very good over time (sexy wise).