Hey Brav,
Trying to get your little brother started in porn?
You should be at least 18 of course, but I have heard of people starting younger. I guess there is a risk of not getting paid if your sponsor found out, but as for legal implications, I don't know how risky it would be. But then, unless you have a credit card, how would you get content etc.?
Bottom line, I'd say it's not the best idea...
Bruce