It is still a sexist term. Using testicles as a synonym for courage, whether you say balls, stones, cojones etc., by definition implies that bravery is a male trait. That's certainly not true. Most men wouldn't brave the pain of childbirth and it was the nuns, not the priests who laid down in front of Marcos' tanks. And as for the animal world, my Jack Russell mix has had his cojones removed and he's still fearless. Even applying the term to a woman, as Carvill did to Ms. Clinton, is at best a back-handed compliment.