Oh, somebody in an academic institution which had links with the archive I was working in, and about whom I had complicated feelings, asked somewhat idly and patronisingly if there were any archives in our care that would make an interesting research project. And thinking it over I sniggered in a juvenile fashion on account of the collection I had recently been cataloguing and thought, 'how about something on the history of male sexual problems?'

And then a lightbulb went off and I thought that that was a really historically underexplored area for which there was this amazing archival resource!