It seems that womenteen (they don't accept being called girls but they are not women yet, I call them womenteen) have day-after regret, because they want a low count of partners, and they want a low partner-count not necessarily because of "slut-shaming" but because they want to feel they are rare and unique, precious, something of divine value, and they want to feel a divine treasure not because "society told them" but simply because this is the innate self-perception women develop and are inclined to. It seems that having a high partner-count makes them feel more common, earthly, available, less divine. So, they continuously ask themselves if the weight of a specific guy is worthy of "a place in the bag of rocks" that they imagine themselves carrying, pulling them down to earth. Because of this, sometimes after the fact, they will have an urge - if they could just say that one rock was placed in their bag by someone else, then "that rock won't count". If everyone thinks that they didn't want the sex, their partner-count won't increase, despite sleeping with the guy. The more I think of it the more it seems that it's not the guy or the sex that they regret, but the increase in the count, the space in what they see as a "bag of rocks". One can even hypothesize that there will be cases where a womanteen sleeps with someone when her count is low, is content the day after and for a few weeks, but, after six months, during which she had slept with a few more, she doesn't like her new count, and then reviews all the partners of those months and literally chooses, which of the guys she "would have pulled out of the rocks bag if she could", and then regards their night together as a regret - she regrets the count rather than the night - following which his life is over, his sole guilt being that after him she met others (whom at the moment - who knows what the future holds - she is not trying to take out of the count).

So, maybe it's time to teach girls that love is not made of stone and choices can't be taken out of the past like pebbles from a bag?