What can parents do about the avalanche of pornography available to their children on tablet, phone and laptop? This question was the starting point for a documentary series that began on Wednesday — and the answer proved unexpected. Having gathered five mothers together and shown them a hair-raising selection of online filth, the programme blithely declared that the best way for these women to ‘make a change’ was ‘by making their own mum-approved porn film’, which they’d then screen for their families and friends.