How do some women go commando?

I get that there's people who hate wearing underwear. I'm not one of them, so bear with me here.

How do women go commando without it being gross? Doesn't your vaginal discharge get all over the crotch of your pants, which can start to smell? What do you do during your period? In my experience, tampons can leak, so are you afraid it's going to soak through your pants?
How do some women go commando?
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