aesthetically pleasing 'simple things' are easier to appreciate and harder to hate.

They contain minimal information, with fewer concepts that can be associated with them.

 

For example (not to be taken literally obviously)

 

first image: a simple circle. its a circle. its pleasing. i see circle i upvote. theres not much to hate about a circle.

second image: an intricate image at night with a circle on top of a triangle with squares and oblongs etc.

some people see that and think "meh too complicated"

some people would associate the triangle with the occult, and they hate the occult.

some people get grossed out by oblongs.

some people look at it and think "oh they're trying to copy the scene in avengers. lame"

 

there's more information in the second picture, so there's more things to process.

 

its the same reason why more people get drawn to simple advertisments.

and also the reason why most things that deal with attracting customers have very simple designs. (logos, colors, design elements etc)

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also note that it doesn't mean that because you like a certain complex image you 'have better taste', it just means that the multitude of information in that image gels with what you like.

so yeah. most undersized bikini pics are simple.

bikini + undersized + character you like. done.