probably for the same reason that for the US release of Live Licks, they had to cover up an anime figure in case society got corrupted by the sight of a pair of tiny cartoon tits
I don't mind a good set of tits on my Rolling Stones record covers. But Please....No more Cocks..or Balls! Sticky Fingers was quite enough, thank you, Mr. Warhol.
the days of tits - or any appendages - on Rolling Stones covers are gone.
All these rebellious bands are too shit scared of being banned from such rock n roll outlets as Walmart.
The only prick or tit you're likely to see on an album sleeve is if Jon Bon Jovi or George Michael pose for a photo on the cover of their next release...