As to why people do it – perpetrators vary. Sometimes, it’s agents of the state, more often it’s not. Often it’s soldiers (one of the exhibits is an army uniform from the Bosnian War, which saw widespread rape of local women). But the aim is always the same: to sow fear, demoralise the enemy and destroy communities. “It’s the cheapest weapon known to man,” war correspondent Christina Lamb notes at one point. “It’s cheaper than a Kalashnikov bullet.”