Child pornography is not illegal because it prevents dirty old men from getting their jollies. It is illegal because it has been deemed that juveniles are unable to make responsible decisions regarding their sexuality. So the trouble is with taking little girls' pictures, not looking at them (although the FBI likes to use the consumers to find the producers). Pre-teen girls just aren't mature enough to make a rational decision before signing a model release.
Which raises some interesting questions regarding you and your girlfriend. Although there is nothing wrong with sexual activity as long as you are both over the age of consent, federal statutes have decided definitively that you are too young to make good decisions about sex. Just something to think about.
Also, and this is just my opinion, anyone under 17 or so who tells another person that they love them is full of shit. People that age have no idea what love is yet, and are usually just basing their ideas off some teen movie or tv show. I read once (in Vice magazine) that in order for a guy to be a man, he has to 1) get his ass kicked 2) kick someone's ass 3) have his heart broken - as in "i want to kill myself" heartbroken, and 4) break someone else's heart - as in she wants to kill herself. Women have a similar set of things they have to go through, except the fighting part is replaced by a sluttiness phase. Point being that pretty much no one in high school can truly claim to have done all of these things, and is therefore too immature to talk knowledgely about love.