I heard about the single male issue ahead of time so I booked every day I went. I arrived in Berlin on a Saturday afternoon and managed to snag the 1 remaining time slot in the evening. When I checked for Sunday there were basically no time slots left but I kept checking throughout the day and someone must've cancelled as there was a Sunday morning slot which I booked right away.
Saturday evening there was a lineup but no lineup for Sunday morning (10am). I think if you go in the morning on a Weekend you could get in if there's no lineup but could be risky.
Monday, Tuesday again no lineups in the morning or evening and there were plenty of slots available on the website so I may have been able to get in with no booking but I didn't want to risk it.
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