Hiruzen widened his eyes at this. "Is it safe? Also, you said Kyuubi-chan, is the Kyuubi a female? Also, when did you begin talking to the Kyuubi?" Naruto decided to answer his questions in order. "It's safe, it's really amazing too, I have almost as much chakra as Kyuubi-chan and with me being able to use her chakra as well, I will pretty much never run out chakra in a fight." Hiruzen nodded to him to continue. "For your second question, Kyuubi-chan can't really be said to have had a gender, she was just a sentient clump of chakra, but recently she decided to try to take on a human form and in her words 'Why would anyone want such obnoxious and useless things in between your legs?! It's uncomfortable!' So she took on a female humanoid appearance and if I didn't know her before she decided to do all this, I would have thought she had been like that from the beginning."