The Christmas song "Baby It's Cold Outside" has become the cause of intense controversy in the US where it's been described as a "hymn to rape" .

"As the father of a teenage daughter" writes Adam Gopnik, "I will stand down to no one in the fight against sexual assault of all kinds".

But, he argues, the worst thing liberal minded people can do is "allow their liberalism to become infected with puritanism".

Producer: Adele Armstrong.