Looks like in the 40's and 50's radium was not only used in watches!
Once Upon a Time, We Used Radium Condoms For Glow in the Dark Sex
It's the same old story. Boy meets girl. They fall in love. Boy uses radioactive condom for virility. Yeah, romance has a shelf life of forever.
In the early 20th century, it was all the rage to add Radium to items. The most famous being watch faces, where the numbers would glow so you could see what time it is in the dark. You know, in case you had to a night-time chemo session.
Some genius thought it would a good idea to add radium to condoms because anything new and mysterious must be good for knocking da boots. Fortunately, you can no longer make your wang glow blue in the dark for pleasure. Now you take a blue pill.[Orau]