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Avery Back, well way back before the modern stainless steel belts and before the pill for birth control and even condoms were hard to come by. They were kept behind the counter and you had to ask for them. With that difficulty young people were less inclined to have PiV sex. They did pet and play and have hand jobs, etc. but rarely sex.
The girls mothers were very protective. If the girl were going out, first she would have to put on her tight panty girdle. Then over that 6 or 7 layers of full stiff petticoats. This provided a pretty good barrier and at least gave some time to think more clearly. And can you imagine getting through that in the back seat of a sedan?
Sorry. Could not resist some history,