Oh, but it goes much deeper than that, anon.
You see, at the heart of /ss/ lies a power dynamic. Instead of the traditional powerful man chases weaker woman, you have a woman in power chasing (or at least interacting with) a weaker male.
In some men, this experience would be novel at first, but quickly wear off as they feel the increasing need to be in charge. For others (/ss/, any thread with muscle women, a sizable chunk of /a/, a good portion of the part of /fit/ that isn't a repressed homosexual), this would fulfill two or three needs. The first, obviously, is intimacy. The second might be validation. You're not unlovable, there's someone who wants you! The third (which is rarer, because most men like to imagine themselves capable) is physical protection/safety under the wing of an aggressive/strong partner.
As you can plainly see, about the only people pushing this are people writing comics, drawing art for no pay on the internet, or posting about it on Malaysian Corn Husking forums. >What about women? Surely there must be female /ss/ enthusiasts?
There are, but it is rarer. They either enjoy watching the power dynamics (without self-inserting), or like the idea of being in control (especially as most media portrays women waiting for the man to make a move).