Girls, why not use an acual diaper for your periods?

I know that of course you won't use any. But what is the reason, what would go wrong? Is it only because it is awkward? I think it could make things a lot easier when you have a long travel or you don't want to have problems with finding a toilet to check and change it. I really mean this question, please don't send joke answers.. To you it is obvious but I don't know what it is like :p
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Girls, why not use an acual diaper for your periods?
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