Go Annalee!

Nina Hartley chimes in in this comments section too. But I liked Annalee Newitz's the best. Skip judiciously unless you have time and brainpower to waste (to summarize - I'm an evil non-feminist because I'm not a socialist - there now, wasn't that simple?):

As a somewhat old-schoolish Marxist, I agree completely that many of us sex postivistas are acutely aware of class and economic issues. Sex positivity, for me, is about liberating sex from the bounds of private property. Sex shouldn’t belong to certain kinds of people in certain kinds of relationships — it should belong to anyone in any way they like. And that means leaving space for people to dislike sex or choose not to have it. I’m very pro-virginity for folks who don’t want to have sex, just as I’m pro-orgy for people who want to fuck ten of their pals. Sex positivity is really about removing sex from (market-based) institutions like “the traditional family” and “marriage.”

Even more than that, I think you’re right to put the term in an historical context — people called it “sex positive feminism” to distinguish it from “anti-porn feminism.” Both epithets aren’t really fair, nor are they necessarily applicable to sex/gender politics in the early twenty-first century. I’ve been experimenting with calling myself a pro-cloning feminist just to freak people out.