Just girding myself for the ending, collecting my thoughts. This stroke story just started from the rendering on the title page, and grew page by page from there really, without much of an overall vision. It's ended up being a story about power.
First of all, the central character is a man who's small - smaller than his daughter and some of her friends. Although he is probably stronger, it nevertheless takes away the usual male physical power base.
Other sources of power are reason, with which his daughter is at least as adept as he is himself, and sex drive/attraction: he's so highly sexed that if a hot girl touches him, he can't stop her escalating things to whatever extent she wants. In this way physical power comes to reside with the girls.
The other ingredient is adolescence and the acquisition of power, from being a child. Oh and sexual curiosity, obviously. 'Obviously' is a word used by teens to express power of course, laying claim to an incontrovertible truth :)