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The overwhelming chatter on the internet is anything that doesn't look natural is therefore ugly. I would agree that no fake breast is every going to be natural and that huge natural boobs are nasty formless floppy messes. What is sexy about implants is in some sense the effort, the desire to be desired or simply to look appealing.
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I respectfully disagree, especially the line regarding huge natural breasts.
Kithara and a few others here might actually take offense at that.
Also, I am not familiar with any overwhelming chatter on the internet concerning unnatural modification being ugly. Yes, there are comments but nothing that comes close to a universal consensus. There have been a good many positive statements made about women who obviously have unnatural looking chests, builds, make-up, clothing, etc.
The excessive eagerness or massive effort put into trying to look a particular way usually backfires and does not look sexy. Think about the standard statement that is made, "Is that or are they real?" The question is never how much they tried or how fake they look but rather how closely did they come to looking organic, effortless, real or natural.
There is something to be said about "A Cheap Date". Even if a woman spends tons of effort to look a particular way it is far better to look like she has put little effort into it. Someone who appears to be "High Maintenance" is less appealing than a "Girl Next Door" that is why these stereotype labels exist. It all comes back to expenditure versus reward.
Basically, is what you are putting into anything worth the effort or result or gain or whatever. For some it is, for others their ability to judge is off and a few lack rational limits. Collectively you end up with the wide range of women out there from the most plastic painted up barbie doll to the rustic unshaven back-to-nature hippie. They all have an appeal it is just depends on how others label it.
For me I would say that if a woman appears to be trying too hard it comes across as desperate, needy or unnatural. It can be attitude, make-up, outfits, actions or even plastic surgery. There is a little warning light that turns on any time I encounter someone like that that will prevent me from finding them truly appealing.
Bottom line: If the person looks that fake they usually are a fake person.
Is the beauty of the beholder in the eye of the BEheld?