When you think of the on-demand economy, I bet you imagine services like Amazon Prime, Uber and Postmates. The London Sperm Bank Donors think of sperm. A new service, dubbed ‘Order a Daddy,’ lets users narrow down results from a sperm donor registry to find their ideal match. Browsing potential fathers is as easy as selecting a few desired characteristics and allowing the search function to do its work. Once finished, it’ll return names — such as ‘Donor 1000’ and ‘Donor 1004’ — with results detailing their physical characteristics. If it seems a good fit, a click of the ‘found out more’ link…

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