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In our all-boys school it was an automatic expulsion offence to be seen walking home holding hands (SHOCK! HORROR!) with a girl from the school next door.
Other automatic expulsion offences included playing soccer, in your own time, for an organised team. ("Soccer is only for common boys. You are young gentleman and rugger is the only game for young gentlemen!").
Equally, taking on a paper round would result in your parents being required to find another school for you. (Once again, only 'common' boys delivered newspapers, not 'young gentlemen').