raw, do you believe that two 7 year old's having sex is right?
it's very rare but it is physically possible in some cases. personally I believe this is wrong. Firstly they're are usually incapable of dealing with the emotions it brings with it. sex releases hormones of various kinds, some of which provide pleasure, some actually seem to create a feeling of attachment to the other participant. others are less well understood. Secondly it has been shown that women (girls) who engage in unprotected (which, let's face it, is most likely at this age), underage sex, are much more likely to get cervical cancer and various other problems. Thirdly at certain ages (probably not at 7, but it has been recorded at 9), it is possible for pregnancy to result. I don't beleive that at the age of 9, or 13, or 14, MOST girls or boys, are ready to become parents.
Any of the above reasons, on their own, are debatable as to whether they should mean illegality, or wrong-ness, but the three together, to me, show total and utter wrongness.
Wrong like lying, stealing or murder?
I would describe young people (both under 15 and within 2-3 years age) engaged in sexual activity as risky/dangerous behaviour like crossing a busy street with your eyes closed. I don't think young people engaged in sexually activity should go through the courts. They should receive councilling, but not arrested and put into juvenile detention. The objective should be to correct behavior, not punish. In the long wrong, punishing children who are innocently exploring their sexuality inappropriately could be even more damaging than the act itself.