They’re just keeping warm!
You’ve never had to survive in the Arctic wilderness, away from the wife and without a penguin close by to ruin from the inside out. Besides, no one’s getting hurt, unless of course you interrupt their intense, rhythmic rutting.
Granted the Attenborough never focused in on bipolars, the clubs they frequent or the internal dialogue they’re constantly running. But then that’s the mainstream for ya. Only the Bipolar Bears t-shirt t-shirt can really be trusted to give it to you straight – and covered in fur.