A lot of younger women (and men) these days treat sex like it’s no big deal. Dating, for example, isn’t just dinner and a movie. It’s hooking up, having sex. So these women basically have little or no morals (the left calls this liberated).
My point? When you’ve done or tried just about everything sexual with a large number of partners by the time you’re 25, you don’t exactly have high standards anymore. On the other hand, if you’re a traditional, moral woman who is a virgin or who has only had sex with their husband, you are probably far less likely to initiate sex with someone else. It would be a big deal rather than a routine act.
A lot of younger women (and men) these days treat sex like it’s no big deal.
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These days? I went to college in the mid to late 70s and what you describe was in full swing, and we certainly did not start it.
I guess if by ‘these days’ you mean close to the last 50 years (if not longer, I really doubt how chaste the bobby soxers were).