Re the Mooncup, I have the dubious honour of being one of the first to sell the infamous sponge tampon (Organic, Grit-free! Natural, Washable, Cheap). If you want to know how effective they were, soak a sponge in water then sit on it. Oh Dear. It was the year of the cruel white trouser, I seem to recall.
Mind you, they'd have been useful in one of my many campaigns-that-never -were, particularly the "Lets bleed unrestrainedly at work, on buses and throughout the home until they give us free sanitary wear" protest which failed to attract any takers. I still wonder why.