Really? I never did.
To the best of my knowledge, the only times I had any kind of sexual contact with anyone I knew was under 16 was when I was myself under 16. Between the ages of 12 and 16, of course, my only aim in life (and that of my mates) was to have as much sexual contact as possible - whether this was with girls my own age or, better still, older 'women' (ie girls 1 or more years older than us).
When I was 21/22 I worked two summers on a holiday camp and was propositioned many times by underage girls - as was everybody else with a penis and two eyes. Basically at that age, there would be no excuse for encouraging or engaging in it. We knew it was both wrong and definitely dangerous to your liberty (or life). I realise this may have been something more of a grey area for some of my 18-yr old colleagues.
Given that we were surrounded by 150 other staff - who were all 18+ and were all on their own personal discovery of sex 'n' drugs, plus all the young single mothers there on holiday, there really was no need to chase young girls. Unless of course you were that way inclined. A few were. The vast majority were not.