Understanding in talking this over with female colleagues is that random hookups are more or less what dating sites are for in germany.
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Also this tt poll, done for all of germany:What is your level of education?
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Sad fact about these "dating" websites is, that they all full of people who feel lonely, but who aren't particularly interested in doing anything about it, most can't even be bothered to send an email longer than "hi".
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This is germany after all, probably not much demand for "serious" dating sites in english.