1. What would a girl in her late teens from this era know/not know about sex? What would she be ignorant about
2. Where this couple, neither of which have a car and both are relatively shy find places to make out, kiss etc?
Also they can't visit each other's apartments societal norms and their own moral codes forbid it.
Note: I've searched teenage dating in the 50s, sex education in thew 50s, what did teenage girls know about sex in the 50s.