I'm in high school now, so it hasn't been too long since I went through this.
In 5th grade, I remember them just basically explaining puberty to us and how girls should use pads and how you should wash your face so that you don't get acne. There was NO mention of cramps or anything like that. They never even said what a tampon was. Seeing as though that was only 5 years ago, they should have at least explained it. They showed the videos to the boys AND girls in the same classroom. I was horrified.
In 6th grade, the actually explained sexual organs and things, but not too in depth. Again, boys and girls were together.
In 8th grade, the basically said "DON'T HAVE SEX UNTIL YOUR MARRIED! STAY ABSTINENT OR YOU'LL GET AIDS AND DIE!!!!!" which isn't very nice to tell an 8th grader, or even true for the most part. They said to use condoms, without even explaining what they were or what they were used for. They didn't even explain what sex was. Boys and girls were still together.
That's pretty much as far as it ever went. I learned more from what my mom told me and what television shows told me than what I learned in school. All they ever did was show us the videos, not explaining anything, and make us embarrassed. Now, things like this don't embarrass me, but they did for the longest time because of the way they were taught.