But no, that's stupid. It's a simple, perfectly valid question that she could've answered in a single sentence and it wouldn't have had any effect on the plot whatsoever. Dodging the question is a bitchy thing to do when she could just say "he can't get pregnant," or "he'd stay female until the pregnancy ends."
Take Oda for example. You know, the author of One Piece. He's been asked, "can Luffy stretch his penis? Can Nico Robin make dozens of boobs?" He gave the answer you could logically expect, and it wasn't "I don't think about it and neither should you."
Fuck Takahashi for saying "you shouldn't think about that." What a control freak. Who is she to tell her fans how they should and shouldn't appreciate her work?