That's postfeminism, I think you mean? And mainly postfeminism isn't "sex-positive" so much as it is a reactionary backlash against 2nd wave feminism's tendency toward slutshaming any woman who didn't fall into line and march alongside her sisters (ALLEGEDLY).
Postfeminism is "sex-positive" in the sense that it's all about how awesome it is to be girly and how gross and narsty those annoying feminists are; girls should go wild! according to this kind of postfeminist attitude. If a woman wants to stay home and raise her kids, well, darn it, postfeminism says there's nothing wrong with that, and it's the dirty stupid "you can have it all" feminists who want to kill the American family! Or who want to shame the women who don't aspire to the things that 2nd wave feminism said women should aspire to. If a man makes a joke that degrades women, the postfeminist says "LAUGH AT IT!!! because it's FUNNY!! why are you so sensitive?!?!" The postfeminist is dtf and she's fun as hell...until you criticize her in some way that she thinks is trying to shame her for just being a woman. And then she's not so much fun.
3rd wave feminism isn't so well defined and I don't think that "wave" has quite crested yet. I see you linked to a wiki page on it, but I'd be surprised to see it offering some kind of cohesive definition. In lots of ways, postfeminism wants to be called 3rd wave feminism...but it lacks credibility since it mostly seems geared towards calling female activists bitches and telling them to stfu about gender-based oppression already.
