Summer etiquette: 47 essential rules – from sex to sunloungers to shopping in swimming trunks

When is it OK to go shirtless? What time can you start drinking on holiday? And can you ask a stranger to apply your sunscreen? Experts explain the behaviour that’s hot this summer – and what’s really, really not

Summer means a loosening of rules and norms. Eating with your fingers is suddenly encouraged, near-nakedness is everywhere and a 6am airport pint is unremarkable. It’s a hot, sticky recipe for social chaos and – if you share my view on showing off ungroomed feet – possibly the end times of human civilisation. Here, then, is everything you need to know about summer etiquette.