As someone who technically studied art history for about five years (although for the last few, I was either distracted by philosophy or completely absorbed by gender studies), I know all too well that every individual expression of creativity is just that, an individual expression of creativity. There is a host of factors that can go into an analysis and without exception, (infinite) multiple analyses are possible. Furthermore, volition is a very complex thing that cannot be waved away like that.
Porn is a whoooole nother topic. As is all work. Do people do work because they want to or because they have to? Do you feel comfortable with everything you do for money? If you do want something, what is the nature of that wanting?
ps. It might be that your sister has a lot of interesting things to say about this, too.
pps. Might I suggest Etant-Donnees bij Marcel Duchamp as a feministically acceptable