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All of a sudden, the Toad Sage busted into booming laughter. "Katsuyu-chan" he said after the mirth had subsided. "If Na-chan heard what you said, she wouldn't be happy."

"True," Katsuyu demurred, "But Toad-sama, we are animals. That is fact. We don't deny our nature or what lies in our subconscious... no matter how crude it may sound. Of course, humans think of themselves as different." Katusyu shook her head. "What I'm trying to say is... Toad-sama... the Jubi is far more than a simple beast. The female vessel it crafted for Naruto-san has all the signs of a highly intelligent creature. Taking advantage of the enemy's basic reproductive drive and sociocultural behaviour, using the enemy's psychological state to better itself, choosing long-term over short-term, those are all higher mental functions. I... I just can't calm myself whenever I think of what sort of danger is inside Naruto-san... and she doesn't seem to want to acknowledge it."

"I see." The Toad nodded. "You were right to be concerned. But, if you're so worried, then why didn't you talk to Na-chan about this?"

"Because... because... there's no way Naruto-san doesn't know about it. Naruto-san's knowledge is a hundred years more updated than mine. It's for her knowledge, not her yin chakra, that the slug clan entered into contract with her. Naruto-san must have come to the same conclusion long before me. The only reason she remains oblivious is because she's subconsciously blocking out everything that is a threat to her identity." Katsuyu shook her head helplessly. "As long as she holds onto her past identity, she won't accept her new body as any more than a simple tool. She'll start to seek refuge in an infantile genderless state. I... that's just not healthy at all. As a doctor, I cannot be unconcerned."

http://www.fanfiction.net/s/5794659/6/