Minor correction, there is very little cp posted on /b/ anymore. You'll find that stuff more freely on other spinoff chans, but rarely on /b/ specifically anymore. It's a lot more tame tbh.
The thing is, cp includes self shots of people under 18. There is TONS of that on /b/, of both genders. It's awfully hard to tell 19 from 17 when you're taking a topless picture of yourself in the mirror.
Nobody, mods included, cares about the borderline cases where the subject may or may not be 18. They care about the pictures of intercourse with 9 year olds.
Meh, I don't really consider all the camwhores on /b/ and the new /soc/ to be cp really. It's when they start to have really small or no tits and larger head to body ratio sizes - 12ish and under - that you're in cp territory. This is true cp, and what the real btards on places like 7chan indulge in. The current race on /b/ is full of the last waves of summerfag and other general newfag cancer. There was a time a lot of actual cp was posted on /b/, but that times' long gone.
Unfortunately, this isn't just a question of interpretation. Legally, there's no differentiation between those two categories. One is more ethically problematic than the other for sure, but you're just as screwed having either on your computer. You can see this most clearly in sexting cases against high school students. You can still get on the sex offender registry for sending a picture of yourself to your boyfriend or girlfriend and there's tons of stuff like that on /b/.
