In the 60s, pin-uppery was a more creative craft than today. Girls didn't just pose pouting and spread-legged. They used disconcerting props such as golliwogs. They had strange hair. They performed such 'exotic' pursuits as limbo dancing and voodoo rituals. They were blacked up, wore folk costumes, or posed with curiously inappropriate animals. Just look at these photos.

As 1960s pop culture exploded into psychedelic optimism, porn was leading the charge. As attitudes became more relaxed, and everyone let it all hang out, more girls became willing to pose. At the start of the decade, models were scarce and often over 40, but by the end of the decade, young girls in their 20s were queuing up to pose in the nude.

Some of the strangest images in pin-up history were created in the 60s, fuelling masturbatory fantasies for a generation of baby boomers. So when you walk in on your grandad jerking off and muttering about "girls with kaleidoscope eyes", you'll know what he's thinking about.

History Of Men's Magazines Volumes 3 and 4, edited by Dian Hanson, are published by Taschen and available now