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California Education Code permits school districts to offer comprehensive sex education, but if they do, they have to "teach respect for marriage and committed relationships."

So far so good.

As is the case with all field trips, parents had to give their permission and could choose to opt out of the trip. Two families did. Those children spent the duration of the 90-minute field trip back at school with another first-grade class, the interim director said.

Sounds like a good plan. I'd say it would be a problem if it was done in secret, but if everybody knows what's going on, I don't see any problem at all. Like somebody in the article said, teacher's marriage is legal.