I thought the first couple of comments had it spot on (which must be a record for CiF). It's really off to make out that women with a different body shape make those pictures look 'grotesque'. It's the same nasty attitude you get when people insist fatter women are 'real' (as if thinner women are not real).
And it suggests that not only is it A-ok to objectify naked women, it's also a woman's body shape changing that makes something stop being 'art' - as if objectifying thin women would be totally unproblematic if only they didn't make things so ugly.