You might have considered such things acceptable, but it was never considered "pretty acceptable" on any general level. It was considered just as unacceptable then, as it is now, to secretly add something to a woman's drink to make her more sexually receptive.
I know what the reality were I lived was. And though we were often without much money because by dad was a alcoholic who tended to spend his money on himself I went to the best high school in town with the best brains/athletics in town, and with most of the children of the wealthy in town as well. A lot of these kids were expected to go places, there were not stupid and they were not going to **** it up by doing something that was considered unacceptable enough to get them in trouble.
" hey guys, what is in this punch?" ..."Oh some champagne, juice, ginger ale and a splash of rum" The fifth of everclear we did not talk about.
Same when we went to the bar to get the lady a drink, we would tell the bartender make us something sweet and high octane. When (if) she asked what it was we would give the name and say "it is not very strong".
Did the girls know we were lying? All but the stupid ones I'll bet. It was a game we played. It was acceptable.