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here in Brazil we have that "sucking your thumb" too, with the same meaning by the way... It's most like... a children sucking his/her thumb looking to something he/she can't get.. there's really no sexual conotation here, when I ready the first translation I understood the idiom without any trouble...
I'm think it's pretty much the same thing in Japan (there are some words and idioms here and there that are a bit similar cause Portuguese, who colonized Brazil, had comercial contact with Japan some centuries ago...)
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