Yes, I didn't enjoy the bit of 'Madness of Crowds' in which Murray discusses at length the unlikely phenomenon of women buying artificial camel toes and rubber nipples to insert in their underwear for the titillation of males.
It's a strange idea, but I'm not sure that I would jump to saying he is wrong to say that young women have sexual power. That's a two edged thing and feminism tends to see it mainly from the exploitative side, but sexual power does exist, and some women have used it as a road to gain other kinds of power.
There are downsides and trade-offs to other avenues to power as well, it's not unique that the same thing can be something to be exploited and also something that can be used, or that not all people will be able to access it equally.
But just looking in terms of kinds of power that can be used to gan something, sexual power is on the list. I'm not sure I'd put any particular type top of the list though.