If they ask, I will tell them.
If they don't, well it's up to them.
I was never given a sex talk, but I was given a "Girlfriend talk" when I got my first proper girlfriend.
My dad knew me and her were "messing around", so one day he sat me down for a talk.
We sat in an uncomfortable silence for 5 minutes, then he declared "Do what you like, just don't get her pregnant" then left the room.
If they don't, well it's up to them.
I was never given a sex talk, but I was given a "Girlfriend talk" when I got my first proper girlfriend.
My dad knew me and her were "messing around", so one day he sat me down for a talk.
We sat in an uncomfortable silence for 5 minutes, then he declared "Do what you like, just don't get her pregnant" then left the room.