i agree we should use the real words like penis or vulva
Yes. My 2 year old son said "boys have penises girls have vulvas" at daycare and our daycare provider's daughter (who's 10) had never heard the word vulva. My provider couldn't be too upset since he was just stating fact though!
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what is the best way to teach it?
I would say it depends on the kids ages
good advice :)