Always thought that was a myth, but a mate of mine was in the Met for years and said it was true. Weird hours make it difficult to meet people, was his reasoning. I went to his wedding and it was full of Old Bill. He was one of the few people I spoke to who’s other half wasn’t in the police.
Other things I thought were myths that he told me were actually true - using sirens because they want to get back to the station house, eating doughnuts (they had a doughnut buying rota), people nicking drugs out of the seizures room for work nights out.