Channel Four have aired a documentary on women who decide to get pregnant by artificial insemination, using sperm donated free of charge by strangers who offer their services via the internet. One such man, a 61-year-old from Yorkshire, claimed to be a retired teacher. He advertised himself on Facebook, and was happy to drive up to 80 miles to park outside a woman’s house, hand over a syringeful of fresh sperm, before heading home. He asked for no payment, except a text to announce each pregnancy and a photo of each baby. Most of the women who called on Clive’s services were in same-sex relationships.