Sex
Kate Lister: "If a man had migraines, cramps and pain five days a month, it would make sense to take time off work"
The British historian publishes in Spain 'A curious history of sex', which includes a chapter on menstruation when Spain debates its possible sick leave.
"It's positive because it forces us to talk about it," he says.
Camellia sanitary napkin advertisement from 1966.