When they are in secondary school or when they ask

Better to solve the queries of their curious mind

I would rather they learn from me than friends...

after schools intro or when needed, if they ask

Or when chances arises, I would explain.

when you know they are reaching puberty

Provide sex education, not sex training

when we can make 2-way communication.

When they are aware of their body.

These things shouldn't be a taboo