What should guys do with hairy armpits?

I guess I have hairy armpits, or so I have been told by my niece at a pool recently. I have only shaved them a couple times when I used to swim competitively. What is the norm for guys and what do women like… natural, trimmed or smooth?

Keep them natural, nothing wrong with that
Trim them so they are neat, not noticeable
Shave them down, women do this so why not
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What should guys do with hairy armpits?
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