Ms Steinfeld, 38, told The Telegraph that the law “stigmatises” the children of couples in mixed-sex civil partnerships. “The difference between marriage and civil partnership is that civil partnership is a modern social institution that is, except for this aspect, free of all of this old school patriarchal baggage. Watch more Everything you need to know about civil partnerships “There is no place for something like this within civil partnerships. It stigmatises children based on their parents’ relationship status – and that just seems so anachronistic.” The couple have said they will not be re-registering their children “on principle”. Why is sex pleasurable? Effects on the body Effects on the brain Reasons that sex might not