"It's your body. Do what makes you happy. I'm not paying for it."

Her rationale for having it done is her body looks as good as it's ever going to (probably true) and she wants to enjoy it while she is young (whatever that means).

Man, this bit is troublesome, isn't it? Maybe she might feel like that's meant to be qualifying her for a branch swing?
Or maybe she's just a quality chick looking into improving herself (and righteously expecting you to up your game too, afterwards)?

Honestly, IF ANYTHING, I'd inform her that new boobs won't raise her value. There are many ways to do it. Direct is pretty simple, "You know I'm not going to please queen jugs right? You know me, and I'm not getting any sort of boob job.", or you can be BP friendly (I actually advise this one, but it's about your frame) "(jokingly) You know I won't love you more because you got bigger jugs, right? But if it makes you happy, at least let's have a hell of a goodbye party for these ones."
I'd probably not say a thing though. She assesses her value, your statement won't change it. Maybe the BP if it could score me some amazing sex afterwards.

Anyway, same old. You improve, you expect a better partner and if she doesn't match, you (should) next. She improves, she'll expect a better partner, and if you don't match, she (should) next.
You're the judge for your improvement, she's the judge for hers, but somehow you have to make it match. That's how it is man.
Only thing worth stressing out is that your improvement to match hers should be about yourself, NOT offering more comfort. So, don't ask her, or she'll ask for comfort and betafy you.

It's her body. She can do what she wants with it.

There is nothing in the world that says you owe her your attention time and affection if she does something you don't like.

It's her body.

So what ?

It's your time, attention and affection.

Don't pay for it, don't co-sign for it.

Dump or downgrade if her paying for it causes you to pay for other things due to her not having money.

The reasons she told you were lies. You're fine with her as she is, but she wants big tits to attract other men.

Tell her to get a nosejob first. Don't try and convince her not to, it will only make you look bad. Go out with your friends.

The first boob job is just the gateway surgery to more and larger boob jobs, face surgeries, nose jobs, eye surgeries, upper eyelid surgeries, and so on. When she's done you won't recognize her.

"To her, this is apparently the incorrect answer. Her rationale for having it done is her body looks as good as it's ever going to (probably true) and she wants to enjoy it while she is young (whatever that means)."

She wants to enjoy huge tits while she is young.

It's hilarious how women think we are retarded, the men that built and maintain the world, isn't it?

This is almost equivalent to you getting a penis enlargement to enjoy in your youth, is it not?

No proper response here, just a forewarning...

Why is she not okay with her body when you state you like it? Once she gets the boobs then how do you expect her to react?

Boob jobs are a form of body modification (disfigurement and pain infliction all to feel good and get attention), lets not kid ourselves. It is equivalent to your GF wanting to get a sexy tattoo sleeve and nipple and tongue piercings all in the same month.

Source: Good friends GF got a boob job and then was full of herself and cheated within a few months. He states he feels that she simply wanted to show them off to many different people.

So you're telling her all the rational reasons to not do it? "Rational...reasons..." You do remember you're talking with a female right?

She wants to do it because she'll "feel" sexier, and so she'll get "more" attention from "other" guys.

You may as well tell her to do it and enjoy them puppies while you can 'cuz she's about to be not your girlfriend.

Tell her it's a good idea and she can get it if she wants.

There's really no point in disagreeing. By agreeing on the other hand, you acknowledge the fact that she isn't perfect.

Women often regret going too small, resulting in multiple surgeries. Have her try different implant sizes with a surgical bra to see the look you like. Actual size of the implant selected will depend on her size and weight (body profile) more than anything.

If she's paying, what's it matter?

Won't be your turn forever, at least you get to be the first one to enjoy then.

As long as she's paying for it, who cares?

As a boob guy I'd say support it, but seeing as you're not, and she's just a girlfriend, it really doesn't matter unless you're going to marry her.

Im going to go against the grain here, as a lot of people see this as a 1D thing. E.g. Any attempt to improve her image is an attempt to improve her SMV and branch swing.

Women are self conscious about everything.

Most girls who have small tits want a Tit job. They're unhappy until this changes. You can't say anything that will change that view of herself as she's likely connected a titjob with her happiness.

She's not going from an A to an F - that would be attention seeking. She's going from an A to a B (but she'll probably go to a c or d - could be testing the water with your reaction). It sounds like a self esteem thing.

She'll likely do this, with or without you.

How to respond? Be unphased - meh whatever. Use it as motivation to boost your own SMV. "Do what you have to do" watch the rest of her actions though and if it's not for you. Walk away.

But don't buy into this - she's doing it to branch swing. She's probably had this on her mind since she was 17.

Who does she want to pay for it?

Never buy a woman boobs, they always take off with them and their new found confidence because so many men are paying more attention to them. However they don't realize their attention never increased, only their perception.

FYI the majority of relationships end after women get a boob job due to their SMV skyrocketing and the man's staying relatively flat.

She isn't getting it because she wants more attention from you, she's getting it because she wants more attention from all men. Definitely a red flag but there's nothing you can do about it.

She wants to enjoy her body while it's young, whatever that means?

Really? You can't quite see what that means?

If it's a shit test here are some one liners:

"While you're at it get your nose done too"
"Might take more than just one boob, try both."
"Good idea! They won't notice anything missing."

Hell even if it's not a shit test have some fun with this. If she wants to swing, let her swing away! You can have a good laugh at her expense.

"I wasn't going to be the one to bring it up, glad you did"
"Get the kind that dispenses ice cold lagers, not the exploding tit sharks"
"Ass and titties ass an titties hmm i have to shoot out a few texts"
"Do they have a surgery that teaches good manners?"
"Make sure to ask for the botox/lypo value pack."

How do I respond to that, if at all? I've essentially said it's stupid, but its her body so do what she wants and I'll support it. Whats the proper response?

As always amused mastery. Fuck logic. Tease the fuck out of her, laugh, and stop caring. I've been realizing more and more that caring too much is a symptom of oneitis - the relationship killer.

she feels incomplete. If the one most important male in her life doesnt give a shit then why does she want to go through all the effort?

redflag to me personally.

Yeah. Boob job for her = branch swing to a better branch.

Have fun with that ass while it's in your court, but don't be surprised when it leaves.

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She is ready to branch over but needs validation from you first i think you may be the test dummie before she goes alpha hunting because they love nice tits i would allow it shes doing it for other guys anyway she will change big time its what women do before they leave you they alter the body, weight loss, hair styles and boob jobs awalt.

Tell her not to get the cheap ones? They look like shit.