I think that it's very important to separate casual sex as we observe it in our culture and casual sex as it could be. All of your points only make sense if we

I think that it's very important to separate casual sex as we observe it in our culture and casual sex as it could be. All of your points only make sense if we make tons of cultural assumptions. Casual sex in and of itself is obviously neither "feminist" nor "anti-feminist." Even here, it depends if you're talking about an idealized, consistent feminism or the perverted reality of modern feminist thought.