I suggest any of your kids, no matter what age they are, to not allow them to go to sex education class in any public/private schools. I was raised up in a lax environment (non-practicing) but still these things were very offensive and awkward to me- of course you feel very shy and embarrassed.
I remember I was freshman in high school and they were doing sex education. I was so offended and angry at one certain thing they showed us. It was really disgusting and I actually yelled out and asked the teacher to turn this off... "WHAT IS THIS?! TURN THIS OFF!" It took me a while to figure out what it was showing, but when I realized what it was I yelled out to the teacher to turn it off, but by the time the teacher looked at the screen it was over though and I was too embarrassed to tell the teacher what I was complaining about, and I felt like I had to protect all the girls in the class that must have been so offended too... The reason they showed this too had really nothing to do with sex but body temperature, so it was so stupid and really meant to just show bad things to break the fitrah. I looked around the class at all the girls sitting around me and they were all sitting there without expression, as if they did not just see what I did, I guess they had seen it before or I just am more sensitive... Now my fitrah has been so ruined that if I was in the same situation I would just close my own eyes, but back then I was ready to close the eyes of those around me and turn of the video tape...
Also, I remember in elementary school they also had a permission slip that you could have your parents sign if they did not want you to do sex education (meaning the default is that it is going to be given unless your parents step in), but it was up to the child (me) to give it to my parents and have them sign it and bring it back! I recall that I didn't want to show it to them, because I wanted to know more about what sex was all about, subhanallah... be on top of that with your kids too. My parents said it would be OK. This sex education though was basically the teacher sitting there and students can ask them anything about Sex, it lasted like 5 minutes and no one really asked anything (I guess most of the kids knew what it was, we were in the 5th grade). The teacher was basically like "OK do you know what it is?" And a couple kids said, "yes" so he was like, "OK good", does anyone have any questions?" LOL
Last story around this, I remember when I was in 3rd grade one student that had just finished sex education at my school (an older 5th grader that I knew) had come to me and told me what sex is, he had no idea what it was so was sharing it with everyone! lol (it is a very funny story that I can't share here actually what he had asked the teacher). That was pretty shocking to me too I remember but I recall that I had to keep asking questions as the boy was using terms that I had no idea what they were. I just thought it was gross and why when I understood it all in the end, but did not give it much thought after that- but it did put many pictures in my mind that were never there before...
I hope these stories help prepare some of the parents out there for what to expect and to be prepared. KEEP KIDS AWAY FROM THIS STUFF AS LONG AS YOU CAN! THEY SHOULD BE PLAYING WITH TOYS AND LEARNING OTHER THINGS!