How much do men think about an attractive woman's appearance in a casual, platonic setting where they're not trying to hit on her?

Assuming you find the girl attractive, but it's very unlikely to go anywhere, and you're not trying to hit on her. Like you've been friends for a long time, or you're both taken or whatever. Are you still checking her out regularly and thinking about how she looks throughout the conversation? What are you actually thinking about her?

How much do men think about an attractive woman's appearance in a casual, platonic setting where they're not trying to hit on her?
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