Here's an insanely erotically charged clip from the 1976 BBC Schools series 'Physical Science'. Even Michael Rodd gets his kit off. I've come to appreciate over the years what a good presenter Michael was (he's still alive, he just makes programmes now rather than appear in them). As a kid, he always seemed a bit stern, occasionally giving the contestants on 'Screen Test' a bit of a telling off. Knowing what I know now as an adult and a father, I admire his restraint.