A few years back I had a spate like that.
One of the earliest addresses was from somone I knew (he works for a security firm!).
It seemed he had downloaded some canoe club pictures from somone he met while on holiday in the Canaries. He also had downloaded a virus with it!
My AV picked it up and he got rid of it for himself, but it showed us both the need to be careful.
TonyV My screenname wasn't quite perfect but enough to worry me at the time.