Wow. I mean...wow.
The fact that you find sexual promiscuity to be "boys being boys," and that women acting "just like guys do" is somehow objectionable, shows EXACTLY why women still have a ways to go in securing equal rights.
The perception that these girls should "act like ladies" is what fuels the divide. If sexual promiscuity is immoral, then argue that point. And say it's immoral for everyone. But don't act like these women should be restricted in some ways that men aren't because it's treating them like "ladies."
That smacks of women being too "delicate" to be in the workplace...