The old norm that boys/men get to ignore such things about girls easily leads to a lot of hurt and harm.
The lessons are not very complicated, but they are next to impossible for a boy to discover when following through the usual paths in life. E.g., I've been a student in five colleges and taught in two more, and I doubt that any of those schools had a course that covered what is in the OP or what would be in my book. Why? The norms are, just don't explain that stuff, especially to boys/men. So, get hurt and harm. Bummer. Instead, get the info out there.
E.g., an approximation to the lesson in the OP is the Erich Fromm remark in his 'The Art of Loving'. I paraphrase:
For humans, the fundamental problem in life is doing something effective about feeling alone.
This statement is especially true for girls/women. A man who does not appreciate this statement has some modules between his ears powered down.
Fromm went on to say that only four solutions have been found, and one of those was "membership in a group". Presto: That's the solution the girls in the OP were working for.
Then the father needs to know about two of Fromm's other solutions: One of them is "love of spouse". So, such a girl can be very tempted to get a boyfriend, maybe sooner and more 'intimate' than her father might wish. Another is 'orgiastic' behavior, that is, get drunk on alcohol, high on drugs, have an orgy, and, thus, suppress the pains for a few hours at, of course, some costs in addiction, infection, social rejection, etc. Fathers need to know this, too. From some news stories, apparently some college girls with 'the hookup culture' and 'bar scene' have discovered this solution.
This stuff, and more should be taught. If I write the book, then one thing to do with it, maybe good, would be to have some good Hollywood people dramatize parts of the book, that is, illustrate with facial expressions, tone of voice, body language, scowls, tears, etc.