Is it a dealbreaker if your partner finds other people more physically attractive than you?

Like for example, if you are a man dating a woman and they think Henry Cavill or Chris Hemsworth are hotter than you.

Or if you are a woman dating a man and they think Jessica Alba or Scarlett Johansson are prettier than you…

Etc.

Thoughts?
Is it a dealbreaker if your partner finds other people more physically attractive than you?
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