Veteran Australian Tv star Ian Smith has filmed a video to teach kids about sex.

The actor, best known for playing beloved character Harold Bishop in Aussie soap opera Neighbours, has made a short film as part of an education drive called Ask Grandad, which will be rolled out to schools Down Under.

In the footage, Smith plays an old man talking to his granddaughter about sex education.

Smith tells News.com.au, "A grandfather worries awfully about his young granddaughter, and his son is totally inept and he quite obviously hasn't talked to his daughter about the serious business of sex. The Grandad sits down at the desk with some condoms and describes how to use them, how to apply them, why they should be used, what they can safeguard you against. It's just a damned good idea."