Having worked in 2 different industries where contact with children was a big part of the job I can tell you that your carefree approach to being friends with and possibly photographing minors is going to land you in trouble one day.
In a way it is nice that you think this way but, unfortunately in today's world you are being very naive.
I am criminal background checked, drug tested and trained in detecting and dealing with child abuse. In my former positions it was absolutely forbidden for a male to be alone with an under age female under any circumstances and in a home visit you could not be alone with male or female. It was also against policy to friend any minor on any social networking site or to share cellphone numbers or email addresses. Not saying it didn't happen but the people who did it could have been setting themselves up for a world of hurt.
Just as an example of how little things can lead to big problems: in one workplace a very nice older gentleman commented on a young lady's hair - a new style or whatever - but he used the word "hot". He never thought and probably never even understood that it could be taken as a sexual overture but his comment was overheard by another staffer and he lost his job. That's how PC we've become and you can hate it all you want and stand against it and all that but don't cry when all DVDs, CDs, VHS tapes, memory cards, cameras and computers are removed from your home one day and you don't see them for a few months while rumors fly around your neighborhood about the child molester who got raided by the Feds. All it takes is one hint from one person who knows that you've been taking pictures of a minor child.
Hell, I wouldn't do this even for a family friend with a parent present, signed agreements notarized and an independent witness sworn in.