Open to interpretation , but I believe in the comics he is referenced as trying to rape the wives, The "teeth" chastity belts on the wives were there to protect them from everyone, including Rictus. As they were to be only for Joe to spawn the perfect male offspring,Was the film suggesting that Rictus Erectus (big guy) is some kind of child molester when he takes little Furiosa from the vault? That's what my girlfriend thought, but I disagree.
I saw that scene as a reference to the Boris Karloff's Frankenstein film, when the monster encounters the little girl and he touches her hair, examines her hands..etc. I think Rictus was just curious because he'd never seen anyone like her before, so it wasn't necessarily with any malicious intent, but I could be totally wrong.
All Joes other offspring (rictus included) are deformed and sickly, which makes the scene "I had a baby brother, he was perfect, perfect in every way" from FR, more impactful as it was Joes first normal born son that was killed when Splendid was run over by his own truck.