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I've read that one of the positive sides of it is hygiene.

If you cut off your arms will you no longer have to wash your armpits?

Someone did a great short story of a society where everyone got their fingernails removed for this reason (as an analogy to circumcision).

Apparently, in the UK many people used to have their teeth removed when marrying.

Not just UK , and not just when marrying. If you could afford it, removing all your teeth before 30 was a great idea, since a rotting tooth and the subsequent infection would most likely kill you. So it just increased your chances.

Washing regularly also helps hygiene. As a bonus it doesn't require cutting off a body part according to the suggestions of a fairy tale.

Circumcision for hygiene is a bit like shaving your whole head so you don't need to use shampoo(Edit: with the difference that hair can actually grow back and doesn't have countless sensitive nerve endings).

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