Well, the study has its limits, and this could be another one of them, so as I said it's far from conclusive. However, in this particular case, I wonder if the kind of entertainment that you indicate really nudges young adults sexuality or limits to expose a widely known but denied truth (in Italy we say "Punchinello's secret", also when someone declares that he has discovered something that everybody else knew very well in advance, it's said that he has "discovered hot water").
I'm thinking for example of pornographic movies, that exist since the beginning of cinematography, and it's not that the women were particularly forced to star in them... Of course not even this is strong evidence, though it's still something.
In my opinion, the biggest piece of evidence in favor of women's promiscuity are sperm wars.