Another point that makes me wonder if there really isn't some censoring going on at Amazon, compare the US cover of this book of Lesbian erotica:
http://www.amazon.com/Cherry-Red-Div...9697556&sr=1-7
With the UK version:
http://www.amazon.co.uk/Cherry-Red-D...697617&sr=1-19
It hardly seems racy enough to black out; no worse than the cover of a slightly bawdy romance novel.