My girlfriend told me I should start working out my lower body more?

So my girlfriend told me she thought my butt was too squishy. I told her no and that at least my butt is firmer than hers. She didn't wanna hear any of this so we decided to compare.
Hers is more soft and smooth to the touch. However my butt jiggles more easily (moving, walking). Hers never jiggles just shakes a bit if she jumps.
Who has the firmest butt?
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My girlfriend told me I should start working out my lower body more?
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