This 48% of K-1 students encountering sexually suggestive material that made them uncomfortable seems like an awfully high percentage. I am wondering how kids so young could be in such high danger of predation when they can't even read. Was this survey taken orally? Is it possible that there is a bias because the suggestion of a problem was made?
Also, young kids have short attention spans. They are not likely to stay on the computer very long, without Mom or Dad or a live audience with which they can share their experiences. They want someone there to see what they see. My experience with K-1 kids is that they hang out on graphically dense sites, where there is color, music, sound and animation. How is it that so many of them would be finding these other inappropriate sites?