He does but indirectly in other words for obvious reasons.
It has been implied that Boa has been sexually abused. Robin and Nami most likely went through the same thing growing up. Same for Viola and all the female slaves living under the Celestial Dragon.
Ginny taken as a slave for the Celestial Dragon seems more realistic and this would explain why Saturn and Akainu gave Bonney a pass (they will kill others in an instant). Kuma finding out and going on a rampage that got him the name "Tyrant" would make sense.
Let's not forget this part and all the rapey vibes Celestial Dragon done in the open to make us despise them.