I'm trying to work out if my perceptions about something in the past are accurate.
When I was a 6th former, I'm sure it was not considered particularly unusual for 6th form girls to be going out with a teacher. There were certainly a few cases in my school, and no-one seemed to make a big deal of it. Perhaps because these were less promiscuous times when 'going out' didn't necessarily mean 'staying in'. The girls were old enough not to be schoolgirls, so why not? Perhaps if the young men in question were actually their A level teachers there might be issues, but as it happened they were either at other schools or PE.
Does this tally with your experience or was this unusual at that time (late 70s) ?