I've been trying to remember when I got sex ed, as a reference for when to provide it to my DD9, and 5th grade sounds about right. Here at home we've already covered the subject of puberty, (DW had her first menses at 9yo, so we needed to get in front of that) but we haven't addressed reproduction and all that goes with it. Coming soon, though.

Our school system doesn't offer sex ed until 7th grade, at which point the most at-risk students will already be 14yos with their brains soaked in hormones, and the curriculum they offer is abstinence-only, so this will definitely be a home project.