So the unintended consequences showed that in 1946—and Ginny would appreciate this—along came the bikini. Clothes, as we know, should have an SPF of 50, but, in the 1950s, as Mr Muller pointed out, we had the Coppertone self-tan girl—and now we have "Muller man". We had Malibu Barbie in the 1970s, and sunbeds—nobody's going to admit to this—in the 2000s. But, you know, the concept of SPF goes as far back as 1962. 