I know people want it to be the same as the manga panels, but you have to realize that even Japan (Yes, EVEN Japan shockface) have some things they just can't show on TV violence-wise. Sexuality wise, they don't seem to give a damn. But at least they care enough to keep gun to the face things out of a children's TV show.
Another brutal example was Zeff eating his own leg in the manga and Whitebeard's face half charred.
WOAH.
Wait.
WHAT?
I don't even.
EH.
I didn't even know that happened…
Then again I didn't start reading the manga until I hit Thriller Bark because at the time the anime was still at Thriller Bark