Spain’s spectacular World Cup win in Sydney earlier this month should only have been a cause for celebration. Instead, an ‘unwanted’ kiss – planted on star player Jenni Hermoso’s lips by the Spanish Football Federation president Luis Rubiales after the match – has sparked national protests, a hunger strike and calls for one of the most powerful men in European football to resign. Guardian Australia’s deputy sports editor Jo Khan tells Laura Murphy-Oates how the kiss fuelled a revolution in women’s football